Heat Control: Preheating, Oil, and Reading the Pan
The same ingredients become a different dish depending on pan temperature. When to add the oil, how to read heat by sound, and which dishes want low heat instead.
Heat the pan first, then add the oil
Pouring oil into a cold pan and turning on the heat ruins two things: the oil sits over the flame long enough to oxidise, and you have no idea what temperature the pan is when the food goes in.
Heat the dry pan over medium-high for a minute or two, then add the oil. It spreads thin the instant it lands and coats the whole surface. When it starts to move in loose ripples, you are ready.
Sound is your thermometer
If food goes in and makes no noise, the pan is cold. Meat then leaches water and steams instead of browning, and no crust forms.
- A sharp hiss: surface moisture flashing off. That is searing temperature.
- A low, steady bubbling: moisture leaving slowly. Right for sautéing and braising.
- Acrid smoke: you are past the oil's smoke point. Lower the heat and start the oil again.
Flicking in a few drops of water works too. If they bead up and skate around the surface (the Leidenfrost effect), you are near 200°C.
Which dishes want high heat, and which do not
High heat is not the default answer. It depends on what you are trying to do.
High heat — when the surface must brown fast while the inside stays underdone: Jeyuk Bokkeum, Chinese stir-frying, the outside of a steak.
Low heat — when you are drawing moisture out slowly or setting protein gently. An Omelette is only tender over low heat; high heat browns and toughens it. The garlic in Aglio e Olio likewise wants low heat for aroma only — once it browns it turns bitter.
Very low heat — dishes that cook in their own juices, like Kedjenou. Too much heat and the base scorches before the vegetables have released anything.
The pan material changes how you control heat
- Cast iron and carbon steel: slow to heat, slow to cool. Preheating takes longer, but the temperature barely drops when food goes in, which is exactly what searing wants.
- Stainless: responsive, and it browns well. It is also the material that exposes under-preheating most clearly — most sticking is a preheating problem, not a pan problem.
- Nonstick: not built for high heat. Use it for things that stick easily — eggs, fish — at moderate temperatures.
Do not crowd the pan
This fails more often than heat control itself, so it gets its own guide — see Browning and the Maillard reaction.