Chapter 22 — Quiz: Spices and Herbs

15 multiple-choice questions and 4 short-answer questions. Answer key with explanations follows.

Multiple choice

1. Most flavor compounds in dried spices are best described as:

A. Water-soluble polysaccharides B. Hydrophobic terpenes and terpenoids C. Charged amino acid derivatives D. Saturated long-chain fatty acids

2. When you "bloom" a spice in oil, you are:

A. Hydrolyzing starches into simple sugars B. Extracting fat-soluble volatile compounds into the fat phase C. Caramelizing sugars on the spice's surface D. Denaturing the spice's proteins

3. Capsaicin produces the sensation of "heat" because it activates:

A. The TAS2R bitter taste receptor B. The umami receptor (T1R1/T1R3) C. The TRPV1 receptor, normally activated by temperatures above ~43°C D. The TRPM8 cold receptor

4. A glass of cold milk relieves chile-pepper burn primarily because:

A. The water in milk dilutes the capsaicin B. Milk is alkaline and neutralizes the pepper's acid C. Casein protein and milk fat help displace and dissolve capsaicin from receptors D. The cold temperature directly destroys capsaicin

5. Saffron is unusual among spices because its main flavor and color compounds are:

A. Insoluble in both water and fat B. Water-soluble rather than fat-soluble C. Released only by enzymatic action D. Volatile only at temperatures above 300°C

6. Whole peppercorns retain their flavor much longer than ground pepper because:

A. Whole peppercorns contain different compounds than ground B. The intact pericarp protects volatile compounds from oxygen and evaporation C. Whole peppercorns are stored at colder temperatures D. Ground pepper spontaneously reacts with itself

7. When you crush a clove of garlic, the sharp flavor develops because:

A. The garlic contains pre-formed allicin in its cell walls B. The enzyme alliinase converts alliin (a stored precursor) into allicin and downstream sulfur compounds C. Atmospheric oxygen reacts directly with garlic carbohydrates D. Mechanical pressure denatures the garlic's proteins

8. Cooking garlic at high heat for 30 seconds before adding it to a dish:

A. Maximizes allicin formation B. Prevents allicin from forming by denaturing alliinase before the chemistry can run C. Has no effect on garlic chemistry D. Converts garlic carbohydrates to sucrose

9. Piperine in black pepper enhances the bioavailability of curcumin in turmeric primarily by:

A. Increasing the absorption of curcumin in the small intestine via membrane transport B. Inhibiting liver enzymes (UGT family) that rapidly conjugate curcumin for excretion C. Binding curcumin and forming a more soluble complex D. Accelerating curcumin's metabolic activation in the bloodstream

10. Cinnamomum verum (Ceylon cinnamon) and Cinnamomum cassia differ most importantly in their content of:

A. Cinnamaldehyde B. Vanillin C. Coumarin (much higher in cassia) D. Capsaicin

11. A spice that is toasted before grinding, compared to one that is ground without toasting, will typically:

A. Have lost most of its flavor through evaporation B. Be more aromatic, with additional Maillard-derived flavor compounds C. Be bitter and unusable D. Release only its non-aromatic compounds

12. Indian garam masala and Moroccan ras el hanout share which underlying chemical strategy?

A. Use only fresh herbs, never dried spices B. Combine multiple fat-soluble volatile compounds for blooming in fat C. Rely entirely on fermentation chemistry D. Use only chiles for flavor

13. Korean gochujang is fundamentally different from a dry spice blend because:

A. It does not contain chiles B. It is a fermented paste in which microbes produce additional flavor compounds during months of aging C. It is consumed only raw, never cooked D. It contains no fat

14. Wood combustion produces volatile flavor compounds that are also present in many spices, including guaiacol and eugenol. These compounds primarily come from the pyrolysis of:

A. Cellulose B. Hemicellulose C. Lignin D. Plant proteins

15. Fresh basil should typically be added to a long-simmering tomato sauce:

A. At the very beginning, so its flavor can develop fully B. About halfway through the cook C. At the end, off the heat, to preserve volatile compounds D. Never; basil should only be eaten raw

Short answer

16. Explain why "tarka" (or tadka, chhaunk) — adding a flourish of bloomed spices in hot fat at the end of an Indian dish — works as a chemical strategy. Why isn't the same spice added at the start sufficient?

17. Capsaicin tolerance is a real, measurable phenomenon. Briefly describe the receptor-level mechanism, and explain why this same chemistry allows capsaicin creams to be used clinically for chronic pain.

18. Compare the two main "cinnamons" sold in English-speaking markets (Cinnamomum verum and Cinnamomum cassia). When does the difference matter, and when doesn't it?

19. Spice blends like garam masala, ras el hanout, and shichimi togarashi each combine many ingredients. Pick one blend, identify three of its ingredients, and explain what each contributes chemically (e.g., a top note, a base note, a heat compound, a Maillard precursor, etc.).

Answer key

1. B. Most spice flavor compounds are terpenes and terpenoids — small, hydrophobic, fat-soluble molecules built from 5-carbon isoprene units. Their hydrophobicity is exactly what makes "blooming in fat" work.

2. B. Blooming dissolves fat-soluble volatiles from the spice into the surrounding fat. The fat then carries those compounds into the rest of the dish.

3. C. Capsaicin binds to TRPV1 — the Transient Receptor Potential Vanilloid 1 receptor — which normally fires above ~43°C, signaling heat damage. Capsaicin tricks the receptor into firing without any actual temperature change.

4. C. Casein protein helps displace capsaicin from the TRPV1 receptor (a relatively recent finding); milk fat dissolves capsaicin (it is fat-soluble); the cool temperature is a secondary contributor. Water alone simply moves capsaicin around without removing it.

5. B. Saffron's main compounds (crocin, picrocrocin, safranal) are water-soluble due to their oxygen-containing functional groups. This is why saffron is bloomed in hot water, not hot oil.

6. B. The intact pericarp of a whole peppercorn protects interior volatiles from oxygen, light, and evaporation. Grinding shatters this protection and dramatically accelerates flavor loss.

7. B. Alliin (a sulfur-containing amino acid derivative) and alliinase (an enzyme) are stored in separate compartments in undamaged garlic cells. Crushing breaks the compartments, the enzyme meets the substrate, and allicin and downstream sulfur compounds form. The garlic is generating its flavor in real time as you cut.

8. B. Heat denatures alliinase before it can convert much alliin to allicin. This is why immediately-cooked garlic is mellow; rest before cooking allows the enzyme time to do its work.

9. B. Piperine inhibits the UGT enzymes that conjugate curcumin in the liver. With slowed metabolism, more curcumin remains bioavailable longer. This was the mechanism formally identified by Shoba et al. (1998); the cooking pairing is much older.

10. C. Cassia is high in coumarin (potentially hepatotoxic at high chronic doses); Ceylon contains very little. For occasional cooking the difference is negligible; for daily high-dose supplementation, Ceylon is the safer choice.

11. B. Toasting before grinding mobilizes additional volatiles to the surface and runs Maillard reactions on amino acids and reducing sugars, producing roasted/nutty notes that pre-toasted spices do not have.

12. B. Both blends rely on fat-blooming of multiple volatile compounds. The specific ingredients differ, but the underlying extraction strategy — hot fat as solvent for hydrophobic terpenes — is shared.

13. B. Gochujang is fermented; bacteria and molds break down the rice and soy components over months, producing free amino acids, organic acids, and modified flavor compounds that no dry blend contains.

14. C. Lignin pyrolysis produces guaiacol, syringol, vanillin, and eugenol — the dominant smoky-aromatic compounds in wood smoke. Cellulose and hemicellulose contribute different (caramel-like, vinegar-like) compounds.

15. C. Fresh basil's volatile compounds are highly heat-sensitive and water-soluble enough to escape as steam during long simmering. Adding at the end (or off the heat) preserves the compounds.

16. Tarka short answer. Tarka works because volatile compounds escape during long cooking. The early-stage addition of bloomed spices builds the dish's foundational flavor by carrying compounds throughout the food in fat, but those compounds slowly evaporate and oxidize over a long simmer. The late-stage tarka delivers a fresh dose of top-note volatiles directly into the finished dish, where they can be appreciated at full intensity. The two stages serve different purposes: foundation building and top-note refresh. Either alone would yield a less complete dish.

17. Capsaicin tolerance short answer. Repeated capsaicin exposure causes TRPV1 receptors to desensitize — they require more capsaicin (or more heat) to elicit the same response. The desensitization can be local (a finger that just touched a chile) or systemic (a person who eats hot food daily). The same desensitization mechanism is exploited clinically: capsaicin creams applied to areas of chronic pain (arthritis, post-herpetic neuralgia) gradually desensitize the local pain receptors, providing relief. Wilbur Scoville himself, in 1912, was working on exactly this medical application when he developed the Scoville heat scale.

18. Cinnamon species short answer. Cinnamomum verum (Ceylon, "true" cinnamon) and Cinnamomum cassia (Chinese cinnamon, also Saigon, Indonesian, Vietnamese) are different plant species with similar but distinguishable flavor profiles — Ceylon more delicate and citrusy, cassia more aggressive and spicier. Chemically the most important difference is coumarin content (much higher in cassia), which has been linked to liver toxicity at high chronic doses. For occasional baking use, cassia is fine — typical consumption is far below regulatory limits. For someone consuming substantial cinnamon daily as a supplement, Ceylon is the safer choice. The label rarely distinguishes; "cinnamon" in most American grocery stores is cassia.

19. Spice blend short answer (example for ras el hanout). A typical ras el hanout might contain (1) cumin — a top-note monoterpene aldehyde compound (cuminaldehyde) that bursts immediately when bloomed in fat, (2) cinnamon (cassia) — a phenylpropanoid (cinnamaldehyde) contributing the warm-spicy mid-note, and (3) cardamom — terpenes (1,8-cineole, alpha-terpinyl acetate) contributing a bright camphoraceous top-note that lifts the heavier compounds. The blend layers volatile compounds with different evaporation rates so that the aroma reads chronologically as the dish is consumed: top notes first, mid notes settling in, base notes finishing on the palate. Other valid examples could focus on garam masala (cumin top-note, coriander citrus-floral, clove eugenol numbing-warmth) or shichimi togarashi (chile capsaicin heat, sansho hydroxy-alpha-sanshool tongue-buzz, dried citrus peel limonene brightness).