What is the difference between sautéing, shallow frying and deep frying?

Recipes use these words as if they were separate skills. They are the same thing — cooking in hot fat — measured out in four amounts, and once you can see what each depth does to the food you can choose between them yourself rather than following the recipe's assumption about what pan you own.

Safety

Step by step

1. Sauté: a film of oil, high heat, constant movement.Barely enough oil to coat the base. The food touches metal directly, so browning is fast but only on whatever face is down at that moment — hence the constant tossing or stirring. Best for small, thin, quick things: sliced mushrooms, prawns, diced onion, greens. The word comes from the French for 'jumped', which is the technique described exactly.
2. Shallow fry: oil a few millimetres deep, moderate heat, turn once.Enough oil to come up the sides a little. The food rests on the base and browns on its underside, then is turned once. You get two well-coloured flat faces and a paler band round the edge. This is the method for fishcakes, burgers, schnitzel, fritters and most breaded things at home.
3. Half-depth fry: oil halfway up the food, turn once.The middle option, and often the best compromise for anything thick that would need a litre of oil to submerge — chicken thighs, thick fish fillets, aubergine slices. Colour is more even because the sides are in oil, but the face resting on the metal always browns hardest, so turn it before it goes too far.
4. Deep fry: food fully submerged and floating free.No contact with the pan at all, oil all round, so every surface cooks at the same rate and nothing needs turning. This is the only method that gives an even crust on an irregular shape — chips, doughnuts, battered fish, tempura. It is also the method that requires real care about volume and temperature.
5. Never fill a deep-frying pan more than a third.Food carries water. When it hits the oil that water flashes to steam and the whole surface foams up violently — several times the resting volume. Two thirds of the pan is empty specifically to catch that. Oil over the rim onto a gas flame or hot element is how kitchen fires start.
6. Control the temperature rather than the hob setting.Deep frying works in a narrow band, roughly 160–190°C depending on what you are cooking. Cold food drops the oil temperature sharply, so add in small batches and let it recover between them. Below the band, food absorbs oil and goes greasy; above it, the outside burns before the inside cooks.
7. Dry the food and lower it away from you.Blot anything wet, shake off excess batter, and lower food in gently with tongs or a spider, moving away from your body so any splash goes across the pan rather than onto your hand and arm.

Tips

• The bubbles rising off deep-fried food are water boiling out of it. When they slow right down, the food has dried out at the surface and is close to done — a more reliable signal than colour on battered items.
• A wide, shallow pan of oil recovers temperature faster than a narrow deep one with the same volume, because more surface is in contact with the heat.
• Drain fried food on a wire rack rather than kitchen paper if you want it to stay crisp. On paper the underside sits in its own steam.
• Anything going into deep oil should be at fridge temperature at most, not frozen with ice on it. Ice makes the oil erupt.

Common mistakes

• Using a sauté depth of oil and then walking away — A film of oil in a hot pan heats very fast and has little thermal mass. It goes from shimmering to smoking in seconds while your back is turned.
• Adding a whole batch of cold food to deep oil at once — The temperature crashes, the food sits below frying temperature and soaks up oil instead of crisping. It comes out heavy and greasy.

If it doesn't work

Questions people ask