Appendix A — Temperature & Time Charts

The kitchen is governed by two variables. Temperature decides what reactions can happen; time decides how far they go. This appendix is your reference for both — the temperatures at which things change, and the times at which changes complete.

A note on precision: cooking is biology and chemistry, not pharmacology. The numbers here are practical-cooking accurate. Different cuts, different ages, different sources of meat or eggs all introduce variability. A thermometer is more reliable than any clock.

A note on safety: where temperatures are flagged for food safety, those numbers come from USDA, FDA, or peer-reviewed pasteurization research. Don't reduce safety thresholds based on this appendix alone — Chapter 35 (Food Safety) gives the reasoning, and Chapter 27 (Sous Vide) gives the time-temperature math for low-temp pasteurization equivalence.

1. Protein Denaturation Thresholds

These are the temperatures at which structural proteins in food coagulate and set. Below the threshold, proteins remain mostly raw or partially set; at and above, they coagulate. Most thresholds describe a transition over a few degrees rather than a hard switch.

🔗 Chapter 7 (Proteins), Chapter 14 (Eggs), Chapter 15 (Meat), Chapter 27 (Sous Vide).

2. Steak Doneness Temperatures (final internal)

These are target final temperatures after rest. Account for carryover (typically 3–6°C / 5–10°F) — pull the steak from heat that much below the target.

🔗 Chapter 15 (Meat) — caveats about ground meat (food safety); Chapter 27 (Sous Vide) for precision-temperature alternative.

3. Food Safety Minimum Internal Temperatures (USDA)

These are conventional cooking targets. Sous vide allows lower temperatures held for longer (Ch 27 for the math).

⚠️ Pregnancy, immunocompromised, and elderly individuals should be more cautious — full pasteurization, no raw or undercooked items.

🔗 Chapter 35 (Food Safety) for the underlying microbiology.

4. Maillard Reaction & Caramelization Thresholds

These are the temperatures at which key flavor chemistry kicks in. Note that water-saturated surfaces stay at 100°C / 212°F until water boils off — this is why a wet steak can't sear and a covered roast can't brown.

🔗 Chapter 8 (Maillard), Chapter 10 (Sugars and Caramelization), Chapter 13 (Enzymes) for PPO.

5. Candy Temperature Stages

Sugar concentration in syrup determines final candy texture. As syrup boils, water evaporates, sugar concentration rises, and the temperature climbs. Each stage corresponds to a specific water:sugar ratio and texture when cooled.

⚠️ Sugar burns are SEVERE — sugar sticks to skin and continues burning. Long sleeves, eye protection, kids out of the kitchen.

🔗 Chapter 10 (Sugars and Caramelization).

6. Oven Temperature Names → Numbers

Old recipes use named oven temperatures. Here's the rough translation. Note that these vary by source and tradition; fan-forced ovens often run ~14°C / 25°F hotter than conventional, so set them lower.

Pizza ovens range 425–480°C (800–900°F). Wood-fired Neapolitan pizza ovens run hotter still.

7. Smoke Points of Common Cooking Oils & Fats

The temperature at which an oil starts to break down chemically — beyond, it produces off-flavors, free radicals, and visible smoke. Use a lower-smoke-point oil for finishing, a higher-smoke-point oil for high-heat cooking.

🔗 Chapter 11 (Fats and Oils), Chapter 25 (Frying).

8. Yeast / Fermentation Temperatures

The microbes that bake your bread, ferment your kraut, and curdle your yogurt all have temperature preferences.

🔗 Chapter 30 (What Is Fermentation), Chapter 31 (Bread and Beer), Chapter 32 (Cheese, Yogurt), Chapter 33 (Pickles, Sauerkraut, Kimchi).

9. Common Roasting Times (oven roasting; whole or large pieces)

Times below assume a 175–200°C / 350–400°F oven and rest after pulling. Always verify with a thermometer.

10. Bread Baking Times & Temps (representative)

🔗 Chapter 17 (Grains and Bread), Chapter 24 (Roasting and Dry Heat), Chapter 31 (Bread and Beer).

11. Boiling Points at Altitude

As elevation rises, atmospheric pressure drops, and water boils at a lower temperature. Cooking takes longer above sea level.

At 2,000 m and above, expect: pasta cooking time +20%, beans much longer, eggs slightly different, breadmaking adjustments needed (add water, add salt slightly, longer fermentations).

12. Refrigerator / Freezer Times (cooked food)

A general guide. Trust your nose and eyes more than the calendar.

⚠️ Two-hour rule: food in the danger zone (4–60°C / 40–140°F) for more than 2 hours (1 hour above 32°C/90°F) should be discarded.

🔗 Chapter 35 (Food Safety), Chapter 36 (Food Preservation).

13. The "First Things First" Cheat Sheet

If you remember nothing else from this appendix:

• Egg white sets at 62°C / 144°F. Yolk firms at 70°C / 158°F.
• Medium-rare steak finishes at 54°C / 130°F.
• Maillard kicks in around 140°C / 285°F. Caramelization around 160°C / 320°F.
• Refrigerator: ≤4°C / 40°F. Freezer: ≤-18°C / 0°F. Danger zone: 4–60°C / 40–140°F.
• Poultry safe at 74°C / 165°F. Whole muscle meat at 63°C / 145°F. Ground meat at 71°C / 160°F.
• Yeast dies at 60°C / 140°F. Yogurt incubates at 43°C / 110°F.
• Water boils at 100°C / 212°F at sea level — about 3°C lower per 1,000 m of elevation.
• A digital thermometer is more reliable than any clock in your kitchen.

🔗 See also: Appendix B (Glossary), Appendix C (Kitchen Lab Master List), Appendix E (Metric/Imperial Conversions).