Deep-Frying Without a Thermometer: Crisp, Not Greasy

Why food goes greasy

Fried food soaks up oil when the oil isn’t hot enough. At the right temperature, water in the food turns to steam the moment it hits the oil, pushing outward and forming a crisp crust that seals the surface. If the oil is too cool, the food sits and absorbs oil before the crust forms. If it’s too hot, the outside browns before the inside cooks. Almost every frying problem comes down to temperature.

The three temperatures

• Medium (about 160–170°C): for food that needs time to cook through, like samosas, thick kebabs and gulab jamun (which needs even lower).
• Medium-hot (170–180°C): the everyday frying temperature, for pakoras, falafel, medu vada and fish.
• Hot (185–190°C): for things that cook in a minute and need to puff, like puris and bhature.

Testing without a thermometer

• Batter drop: drop a little batter or dough in. If it sinks and stays down, the oil is too cool. If it sinks, then rises steadily within 2–3 seconds with lively bubbles, it’s medium-hot. If it rises instantly and browns within seconds, it’s very hot.
• Wooden spoon: dip the handle of a wooden spoon in. Steady small bubbles around it mean the oil is ready for most frying; a vigorous rush of bubbles means it’s very hot.
• Bread cube: a 2 cm cube of bread should turn golden in about 60 seconds at medium-hot.
• Never wait for smoke. Smoking oil is too hot and starting to break down.

Frying well

1. Use enough oil: at least 5 cm deep, in a karahi or heavy pot. A karahi’s curved shape needs less oil for the same depth.
2. Fry in batches. Each piece cools the oil. Add only enough to cover about half the surface, and let the oil recover between batches.
3. Lower food in gently from close to the surface, away from you.
4. Turn once or twice with a slotted spoon. Most things need 3–5 minutes.
5. Drain on a rack or on paper. A rack keeps the bottom crisp.
6. Salt or chaat masala straight away, while the surface is hot.

Which oil?

Use a neutral oil with a high smoke point: sunflower, canola, corn or peanut oil. Ghee gives wonderful flavour for sweets like jalebi and puris but is expensive in quantity. Mustard oil should be heated until it just smokes, then cooled slightly, before frying in it.

Reusing oil

• Let it cool, then strain through a fine sieve or cloth into a clean jar.
• Oil used for vegetables and pakoras can be reused 2–3 times; oil used for fish keeps a fishy taste, so keep it separate.
• Throw it away when it turns dark, thick, foamy or smells sharp.
• Never pour used oil down the sink. Cool it, seal it in a bottle and put it in the rubbish.

Safety

• Keep children and pets away from the stove.
• Never leave hot oil unattended.
• Dry wet food before frying, as water makes oil spit violently.
• If oil catches fire, turn off the heat and cover the pan with a lid or damp cloth. Never use water.

For lighter alternatives, see our guide to lighter desi cooking, which covers air-frying and shallow-frying.