Classical and modern Western cooking techniques and heat transfer
Scope
This domain tests how heat moves through food and how cooks choose a method: conduction, convection, radiation, moist or dry heat, and the physical changes that create texture and flavour.
Core rules
- Conduction moves heat through solids; convection moves it through fluids and air; radiation transfers without contact. A combi oven uses forced convection plus steam.
- Water boils at 100 °C at sea level; steam carries latent heat, so steaming is fast but keeps food moist.
- Protein denaturation begins around 60 °C; collagen gelatinisation needs 70–90 °C and time. Higher heat speeds browning but can toughen lean proteins.
- Maillard browning occurs between amino acids and reducing sugars, typically above 140 °C; caramelisation is sugar breakdown. Both need low moisture.
- Sous-vide uses precise low-temperature circulation. Pasteurisation depends on time at core temperature and thickness; a thicker product needs much longer.
- Resting allows carryover cooking and juice redistribution.
Worked example
A 2 kg beef roast is cooked at 160 °C to a core of 54 °C for medium-rare, then rested 20 minutes. Carryover may raise the core by 3–5 °C. If the target is 54 °C final, pull at about 50 °C. A thin steak cooked the same way would overshoot because it heats faster.
Traps
- Repeating that searing "seals in juices"; it does not.
- Confusing Maillard browning with caramelisation.
- Scaling cooking time linearly with weight; heat penetration is not linear.
- Ignoring carryover cooking and serving overcooked meat.