Appendix D — Substitutions and Allergens

This appendix is a working reference for adapting recipes — for allergies, for ingredient availability, for dietary preference, for what's already in your pantry. Every substitution is annotated with the reason it works (the science) and the limits of where it doesn't.

⚠️ A safety note for severe allergies. This appendix offers substitutions for cooking adaptation, not for medical management. If a severe allergy is in play, work with an allergist and read every label. Cross-contamination can occur even when ingredients are technically substitutable. Always read packaging.

1. The Big Eight Allergens (US) and Sesame (Top 9)

By US law (FDA, FALCPA + FASTER Act 2021), the major allergens that must be disclosed:

Milk — dairy products and many "veggie" cheeses, breads, sauces, soups, sausages
Eggs — also pasta, baked goods, sauces (mayo, hollandaise), some wines
Fish — surimi, Worcestershire sauce, Caesar dressing, imitation crab
Shellfish — crustacean (shrimp, crab, lobster); molluscan (clams, oysters, mussels — sometimes regulated separately)
Tree nuts — almonds, walnuts, cashews, pecans, pistachios, hazelnuts, macadamias, Brazil nuts, pine nuts (legally a tree nut for labeling though botanically a seed)
Peanuts — botanically a legume, allergen-distinct from tree nuts (some people allergic to one and not the other)
Wheat — bread, pasta, soy sauce (most), beer, many sauces and seasoning blends
Soybeans — soy sauce, tofu, edamame, many vegetable oils blended with soy oil, lecithin (often soy-derived)
Sesame (added 2023) — tahini, hummus, halva, many seed blends, some breads, many Asian cuisines

Other regions add: celery, mustard, lupin (UK/EU); molluscs separately (UK/EU); buckwheat (Japan).

2. Egg Substitutes (Chapter 14)

Eggs do many jobs. The substitute depends on which job.

For binding (in burgers, meatballs, veggie patties)

Flax egg (1 Tbsp ground flaxseed + 3 Tbsp water, sit 10 min): mucilage gels and binds. Makes ~1 egg.
Chia egg (1 Tbsp chia + 3 Tbsp water, sit 15 min): same idea, slightly nuttier.
Mashed potato (¼ cup): for veggie burgers especially.
Cooked rice or oatmeal (¼ cup): for some burger formulations.

For leavening (in cakes, quick breads)

Baking powder + water + oil: 1.5 tsp baking powder + 1.5 Tbsp water + 1.5 Tbsp oil per egg. Adds lift, no protein structure.
Carbonated water (¼ cup) + a pinch of baking soda: similar idea for pancake batters.

For moisture / richness (in baking)

Mashed banana (¼ cup per egg): adds banana flavor.
Applesauce (¼ cup per egg): mild flavor.
Silken tofu (¼ cup, blended smooth): protein-rich, neutral.
Yogurt or buttermilk (¼ cup): adds tang.

For emulsions (mayo, hollandaise, aioli)

Aquafaba (3 Tbsp = 1 egg or 2 Tbsp = 1 white): chickpea cooking liquid, contains saponins and protein. Whips like egg whites. The science: discovered in 2014 by an Indiana home cook posting on online forums — folk-science at work.
Soy lecithin (½–1 tsp granules + small amount water, blended): neutral emulsifier.
Commercial vegan mayo (already-formulated emulsions).

For protein structure (custards, soufflés, meringues)

Aquafaba for meringues works remarkably well. Whip 6 Tbsp until stiff peaks (= 1 egg white). Sweetened, baked at low heat.
Custard base alternatives: silken tofu blended with cornstarch + sugar + flavoring. Different texture but workable.
Soufflé without eggs: very challenging. Aquafaba can substitute the whites but the structural network is weaker.

Commercial egg replacers

Bob's Red Mill, JUST Egg (mung-bean-based, for scrambles), Follow Your Heart VeganEgg. Each has different applications listed on packaging.

🔗 Chapter 14 (Eggs) for the chemistry of why each substitute works (or doesn't).

3. Dairy Substitutes (Chapter 16)

Milk (drinking / cooking)

Soy milk: most protein-similar to cow milk; works well in baking, coffee, creamy sauces. Be aware of soy allergy.
Almond milk: thinner; nutty flavor; less protein. Fine for baked goods where structure isn't dependent on milk protein. Tree-nut allergen.
Oat milk: creamier mouthfeel; works in coffee (especially "barista blend" formulations); slightly sweet.
Coconut milk (canned): rich; tropical flavor; high in saturated fat. Good for curries, ice cream, some baking.
Cashew milk (homemade or commercial): creamy, mild; tree-nut allergen.
Rice milk: thin, hypoallergenic; works in basic baking; not great in coffee (separates).
Hemp milk: similar to soy in protein, distinctive flavor.
Pea milk (Ripple): unusually high protein for plant milk.

Cream (heavy)

Coconut cream (cream from top of a chilled can of full-fat coconut milk): closest in fat content. Whips like cream when chilled.
Cashew cream (1 cup cashews soaked, blended with ¾ cup water): rich, neutral with proper soaking.
Aquafaba whipped + agar or stabilizer: for whipped applications, less fatty.

Butter

Coconut oil (refined for neutral flavor): solid at room temperature, like butter. 1:1 by weight. Higher saturated fat but plant-derived.
Vegan butter blocks (Miyoko's, Earth Balance, Country Crock plant-based): formulated to mimic butter's fat-water emulsion. Most are 1:1 substitutable.
Olive oil (in savory uses): different flavor; works in many cooking applications, less in baking. Reduce by ~25% for fat ratio.
Avocado: in baked goods, mashed avocado replaces butter at roughly 1:1 in some recipes. Adds slight flavor and color.

Cheese

Nutritional yeast: cheesy, umami-rich; great for "cheesy" sauces, popcorn, pasta toppings.
Cashew-based cheese: blended cashews + nutritional yeast + lemon + garlic + miso = a remarkably cheesy spread.
Tofu-based ricotta: blended tofu + lemon + nutritional yeast + salt approximates ricotta in lasagnas.
Commercial vegan cheese has improved dramatically — Miyoko's, Violife, Treeline, Daiya. Look for ones using cashew base + cultures (some use precision-fermented dairy proteins, Ch 38 — these aren't vegan).

Yogurt

Coconut yogurt: thick, rich, can be cultured at home with vegan-friendly cultures.
Soy yogurt: most protein-similar to dairy yogurt; cultures well.
Cashew yogurt: creamy, mild.
Almond yogurt: thinner.

Lactose-intolerant but not allergic

Many lactose-intolerant people tolerate aged cheese (most lactose digested by bacteria), butter (very little lactose), yogurt (live cultures partially digest lactose). And lactose-free milk (lactase enzyme added) is dairy chemistry-wise but lactose-managed.

4. Wheat / Gluten Substitutes (Chapter 17)

⚠️ Celiac disease is real and serious. Gluten-free for celiac requires not only avoiding wheat/rye/barley but also avoiding cross-contamination. Shared utensils, fryers, cutting boards, even flour-dusty kitchens can be a problem. This isn't a fad — it's a documented autoimmune condition.

For thickening sauces

Cornstarch (1 Tbsp = ~1.5 Tbsp flour): more transparent, glossier finish; doesn't tolerate prolonged boiling well.
Arrowroot (1 Tbsp per cup): clear, less affected by acidic ingredients.
Potato starch: similar to arrowroot.
Tapioca starch (1 Tbsp per cup): holds up to freezing; good for fruit pies.
Rice flour: less effective for thickening (needs more), but works.

For breading / dredging

Rice flour + cornstarch (50:50): light coating, often used in tempura.
Crushed cornflakes, almond meal, panko-style gluten-free breadcrumbs.
Chickpea flour (besan): for fritters, pakoras — also adds protein.

For baking (cakes, breads, cookies)

Gluten-free flour blends (commercial): typically rice + potato + tapioca + xanthan gum. Cup-for-cup substitution often works for cakes/cookies; bread is harder because gluten's elastic network is the structure.
Almond flour: dense, nutty; great for cookies, financiers, almond-based cakes.
Coconut flour: very absorbent; need ~25% the volume of regular flour, plus extra liquid and eggs.
Sorghum, teff, millet, buckwheat, oat (certified GF): ancient grains, each with its own character.
Xanthan gum (½–1 tsp per cup of GF flour) or psyllium husk (1–2 Tbsp per cup): provides binding/structure that gluten would normally provide.

For pasta

Rice pasta: most familiar substitute; cooks differently (overcook quickly).
Chickpea pasta (Banza et al.): higher protein, slightly bean-y.
Lentil pasta: similar.
Buckwheat soba (verify 100% buckwheat — some have wheat): naturally GF.

For beer

Naturally GF beers (sorghum, rice, gluten-removed processes): widely available.
Cider, mead, hard kombucha: alternatives.

🔗 Chapter 17 (Grains and Bread) for the chemistry of why gluten is structurally hard to replace.

5. Soy Substitutes

For tofu

Chickpea tofu (made from chickpea flour): denser, beanier.
Lentil "tofu" (red lentils + water, blended, set): possible.
Egg "tofu" (Japanese tamago dofu — silken-style, mostly egg): different but in similar role.

For soy sauce

Coconut aminos: sweeter, lower-sodium, very similar profile.
Liquid aminos: hydrolyzed plant protein; some use soy.
Tamari: traditionally soy-based but often wheat-free (good for celiacs, but NOT soy-free).
Fish sauce + a sweetener: very different flavor but sometimes works in marinades.

For tempeh

Chickpea tempeh (commercial — Tempeh Lab, others): same fermentation, different bean.
Seitan (gluten-rich, NOT for celiacs).

For miso

Chickpea miso: same fermentation principles, no soy.
Adzuki miso, lupin miso: less common.
Yeast extract (Marmite-style): adds umami but very different.

🔗 Chapter 19 (Legumes), Chapter 33 (Pickles, Sauerkraut, Kimchi, and Miso) for the chemistry.

6. Tree Nut & Peanut Substitutes (Chapter 19)

Note: peanut allergy and tree nut allergy are distinct (peanuts are legumes, tree nuts are fruit seeds). Some people allergic to one but not the other; many allergists recommend avoiding both for safety.

For nut butters (peanut/almond/cashew butter)

Sunflower seed butter (sunbutter): closest texture; nut-free; sometimes turns green when baked with baking soda (chlorogenic acid + alkali = harmless color change).
Tahini (sesame): similar texture; sesame is a top-9 allergen.
Pumpkin seed butter (pepita butter): less common but works.
Soy nut butter: similar texture; soy allergy issue.
Coconut butter (different from coconut oil — pulverized whole coconut): sweeter.

For nut flours (almond meal, hazelnut)

Sunflower seed meal: nut-free; different protein/fat profile.
Pumpkin seed meal: less common.
Coconut flour: very different absorbency.

For garnish (chopped nuts)

Toasted seeds (sunflower, pumpkin, sesame), toasted coconut flakes, crispy quinoa, roasted chickpeas.

7. Fish / Shellfish Substitutes

For fish in soups / pasta

Mushrooms (especially shiitake, king trumpet): meaty texture.
Hearts of palm (jackfruit-style): texture surprisingly fish-like in some preparations.
King oyster mushroom sliced thin and seared: scallop-like.

For shrimp / crab

Hearts of palm "crab": shredded hearts of palm + Old Bay + mayo = remarkably crab-like cake.
Commercial vegan shrimp (konjac-based, often): increasingly available.

For umami (the savory depth fish often provides)

Mushrooms: dried shiitake especially.
Miso: fermented depth.
Soy sauce (or tamari, or coconut aminos).
Nutritional yeast.
Tomato paste caramelized.
Kombu (kelp): essence of dashi; vegan umami foundation.

For fish sauce specifically

Mushroom soy sauce.
Fermented bean / vegan fish sauce (commercially available).
Tamari + miso + lemon juice mixture.

🔗 Chapter 6 (Taste) and Chapter 30 (Fermentation) for the umami chemistry.

8. Sugar Substitutes (Chapter 10)

Different sugar substitutes behave differently in cooking. In baking, structure matters — granulated sugar isn't just sweet, it's structural.

Direct sugar substitutes (caloric sweeteners)

Honey (¾ cup per cup sugar, reduce other liquid by 2 Tbsp, lower oven 25°F): hygroscopic; browns faster.
Maple syrup (¾ cup per cup sugar, similar adjustments): adds flavor.
Agave (⅔ cup per cup, less liquid, lower temp): higher fructose, less sucrose.
Coconut sugar (1:1): grainier, slightly molasses-y.
Date paste or date sugar (1:1 to ¾:1): adds fiber and minerals; granulated form works in some baking.

Non-caloric sweeteners

Stevia: very intense; tiny amounts; some find aftertaste; structural problem in baking.
Erythritol: bulk like sugar; cooling sensation; doesn't brown.
Allulose: behaves more like sugar in baking; browns; recently approved in many regions.
Monk fruit: intense; often blended with erythritol.
Aspartame, sucralose, saccharin: heat-stable to varying degrees; mostly for sweetness without structure.

For caramelization specifically

You can't really substitute — caramelization is sugar's chemistry, and most non-caloric sweeteners don't undergo it. Allulose is the exception (does brown and caramelize). For caramel-flavored items without sugar, look at allulose-based products or flavor extracts.

🔗 Chapter 10 (Sugars and Caramelization).

9. Oil / Fat Substitutes (Chapter 11)

For butter in pan-cooking

Olive oil, avocado oil, neutral vegetable oil, ghee, lard, tallow — each with different smoke points.
Want the flavor of butter? Browned butter (where allergens permit), ghee (butter clarified, more lactose-free), or brown-butter-flavored coconut oil (some commercial products).

For frying (high heat)

Use a high-smoke-point oil regardless: refined avocado, refined peanut, refined sunflower, vegetable oil. Olive oil is the wrong tool for deep-frying.

For oil-free cooking

Water sauté: works for vegetables, won't sear.
Vegetable broth sauté: adds flavor.
Aquafaba for some applications.
Nonstick pan + tiny amounts of oil-water emulsion (cooking sprays).

For low-fat baking

Applesauce for ½ the oil/butter (changes texture; works in muffins, brownies).
Greek yogurt for half the butter in some cakes (where dairy is OK).
Mashed avocado for some butter (chocolate baking).

🔗 Chapter 11 (Fats and Oils).

10. Ingredient Substitutions (Pantry Edition)

Baking powder ↔ baking soda

1 tsp baking powder = ¼ tsp baking soda + ½ tsp cream of tartar + ¼ tsp cornstarch (homemade single-acting baking powder).
1 tsp baking soda + 1 cup buttermilk = approximately the leavening of 2 tsp baking powder + 1 cup milk.

Buttermilk

1 cup whole milk + 1 Tbsp vinegar or lemon juice; sit 10 min until thickens.
Plant-milk version: 1 cup soy or oat milk + 1 Tbsp acid.

Heavy cream (cooking, not whipping)

¾ cup whole milk + ¼ cup melted butter (for richness in cooked sauces only — won't whip).
Evaporated milk (in some applications).

Self-rising flour

1 cup all-purpose flour + 1.5 tsp baking powder + ¼ tsp salt.

Brown sugar

1 cup white sugar + 1 Tbsp molasses (light) or 2 Tbsp molasses (dark).

Cake flour

1 cup all-purpose flour − 2 Tbsp + 2 Tbsp cornstarch.

Vanilla extract

Maple syrup or coffee can stand in (different flavor) in some recipes.
Bourbon (in baking, alcohol cooks off) for a different richness.

Lemon juice

1 Tbsp lemon = ½ Tbsp white vinegar + ½ Tbsp water (less bright but acidic).
Or use lime, or rice vinegar, or any cooking acid that fits.

Wine (cooking)

White wine: white grape juice + 1 Tbsp white vinegar per cup.
Red wine: pomegranate juice or grape juice + balsamic.
Or stock + vinegar.

11. The Universal Principle

A substitution works when it does the same JOB. Identify what job the original ingredient is doing — sweetness? structure? leavening? emulsification? umami? texture? acidity? flavor signature? — and choose a substitute that does that job. The flavor will shift; that's the cost. The science is preserved when the function is preserved.

This is also Chapter 39 (Recipe Design) in microcosm: a recipe is a hypothesis about what ingredients can do. A substitution is a different hypothesis. Test it. Iterate. Keep notes in your kitchen lab notebook.

🔗 See also: Appendix C (Kitchen Lab Master List) for protocols that specifically include substitutions; Appendix B (Glossary) for technical-term definitions; the relevant ingredient chapter (Ch 14 eggs, Ch 16 dairy, Ch 17 grains, Ch 19 legumes/nuts, etc.) for the chemistry.