Few things beat the crunch of a golden egg roll or a piece of crispy fried chicken. The deep frying cooking method fully submerges food in hot oil, so it cooks on all sides at once and forms a crisp crust while the inside stays tender. Here’s how it works, the best oil and temperature, and how to deep-fry safely at home.
Jessica’s Recipe Science
- The bubbles around frying food are water escaping as steam, which dries the surface into a crisp crust.
- Oil that isn’t hot enough lets the coating soak up oil before a crust forms, so the food turns greasy instead of crisp.
- Adding too much food at once drops the oil temperature, so fry in small batches and let the oil recover in between.
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What is Deep Frying?
Deep frying is a dry-heat cooking method that cooks food fully submerged in hot oil, usually between 325 and 375ºF (163 and 191ºC). When food hits the oil, surface moisture turns to steam and bubbles away, and the outside dries into a crisp, golden crust through the Maillard reaction. The crust and coating help shield the inside, which cooks through gently and stays moist.
Because the oil surrounds the food, it cooks on every side at once and usually finishes faster than pan frying, which uses a shallow layer of oil and needs flipping.
Deep Frying at a Glance
| Factor | Details |
|---|---|
| Heat type | Dry heat (cooking in fat) |
| Oil temperature | 325 to 375ºF (163 to 191ºC), most often 350ºF (177ºC) |
| Oil depth | Enough to fully submerge the food, usually 2 to 3 inches, with the pot no more than half full |
| What happens | Surface moisture turns to steam and the coating dries into a crisp crust while the inside cooks |
| Best foods | Battered or breaded chicken and shrimp, egg rolls and wontons, vegetables, cheese sticks, and doughs like churros |
| Typical time | A few minutes for small pieces, longer for bone-in chicken |
| Equipment | A heavy Dutch oven or deep fryer, a thermometer, a spider strainer, and a wire rack |
How to Deep Fry
These steps work for most deep-fried foods. Check your recipe for specific times and temperatures.
Choose a Deep, Heavy Pot
A heavy Dutch oven or deep, wide pot holds heat well when you add food, or you can use an electric deep fryer with a built-in thermostat. Add enough oil to fully submerge the food, usually 2 to 3 inches, and never fill the pot more than halfway, since the oil bubbles up when you add food.
Pick a Neutral Oil with a High Smoke Point
Use a neutral-tasting oil with a smoke point well above your frying temperature. Peanut, canola, vegetable, and soybean oils (about 400 to 450ºF) are the most common choices for deep frying. You’ll need about 1 to 3 quarts, depending on pot size.
Dry and Coat the Food
Pat the food dry, since water causes hot oil to splatter. Coat it in flour, batter, or a three-step breading, then let any excess drip off. Keep pieces about the same size so they cook evenly.
Heat the Oil to 325 to 375ºF
Heat the oil over medium heat and check it with a deep-fry or instant-read thermometer that reads above 400ºF (204ºC). Most foods fry best at 350ºF (177ºC). Use a little lower heat for thick pieces that need time to cook through, like bone-in chicken at about 320ºF (160ºC) in my Buttermilk Fried Chicken, and a little higher, up to 375ºF (191ºC), for small foods that cook in a minute or two. Above 400ºF, the outside can burn before the inside is done.
Fry in Small Batches
Gently lower the food into the oil with a spider strainer or tongs, keeping it away from you so the oil doesn’t splash toward you. Add only a few pieces at a time, since cold food lowers the oil temperature. Turn the food as needed for even browning, skim out loose bits of coating between batches, and let the oil return to temperature before adding more.
Drain on a Wire Rack
Lift the food out with a spider strainer and let the extra oil drip back into the pot. Set it on a wire rack over a sheet pan instead of directly on paper towels, which trap steam and soften the crust. Season with salt right away, away from the pot. To keep batches warm, hold them on the rack in a 200ºF (93ºC) oven.
Deep Fry Safely
Never leave hot oil unattended. Keep a lid or sheet pan nearby, and if the oil catches fire, turn off the heat and cover the pot; never use water on a grease fire. Keep children and pets away from the stove, and if the oil starts to smoke, turn down the heat.
Strain, Store, or Dispose of the Oil
Let the oil cool completely in the covered pot. If it still looks and smells clean, strain it through a fine-mesh strainer and store it in a sealed container for reuse. Don’t reuse oil that has turned dark, smokes, foams, or tastes off. To dispose of it, pour the cooled oil into a sealed container and take it to a local recycling drop-off; many communities accept used cooking oil. Never pour oil down the drain.
Best Foods for Deep Frying
Deep frying works best for foods that cook through in the time it takes the outside to turn golden, especially when they’re coated, battered, or wrapped.
Chicken and Seafood
Breaded or battered chicken and shrimp get an extra-crunchy crust in hot oil while the meat stays juicy. Fry chicken to 165ºF (74ºC). Try my Buttermilk Fried Chicken or Beer-Battered Shrimp Tacos.
Egg Rolls and Wontons
Thin wrappers puff and blister into a shatteringly crisp shell in just a few minutes. Try my Crispy Vegetarian Egg Rolls or Crab Rangoon.
Vegetables and Cheese
Coated vegetables and cheese fry quickly at a slightly higher temperature, so the outside crisps before the filling melts out or overcooks. Try my Fried Squash Blossoms or Mozzarella Cheese Sticks.
Advantages and Disadvantages of Deep Frying
Advantages
- Crisp, golden crust: Hot oil dries and browns the surface quickly.
- Fast and even: Oil surrounds the food, so it cooks on all sides at once.
- Moist inside: The coating and crust shield the food while it cooks.
- Consistent results: Once the oil is at the right temperature, every batch cooks the same way.
Disadvantages
- Lots of oil: You’ll need several cups to quarts of oil, plus a plan for storing or disposing of it.
- Safety risks: Hot oil can splatter or catch fire if it overheats.
- Needs temperature control: Oil that’s too cool turns food greasy, and oil that’s too hot burns it.
- Mess and smell: Frying can leave splatters and lingering odors in the kitchen.
Recipes That Use Deep Frying
Try deep frying with these reader favorites, or make my Homemade Churros for a sweet treat.
Frequently Asked Questions
Most foods deep fry best at 350ºF (177ºC), within a range of 325 to 375ºF (163 to 191ºC). Use the lower end for thick foods like bone-in chicken and the higher end for small foods that cook quickly. Use a thermometer to keep it steady.
Choose a neutral oil with a high smoke point, like peanut, canola, vegetable, or soybean oil. They can handle the heat and won’t add strong flavors to the food.
Use enough oil to fully submerge the food, usually 2 to 3 inches deep or 1 to 3 quarts depending on the pot. Never fill the pot more than halfway, since the oil rises and bubbles when food is added.
Yes, if it still looks and smells clean. Let it cool, strain out any bits of food, and store it in a sealed container. Throw it out if it turns dark, smokes, foams, or develops an off flavor.
Deep frying fully submerges food in hot oil, so it cooks on all sides at once. Pan frying uses a shallow layer of oil that comes partway up the food, so you flip it to cook both sides.
The oil probably wasn’t hot enough, or too much food went in at once and cooled it down. Keep the oil at 325 to 375ºF (163 to 191ºC), fry in small batches, and drain the food on a wire rack.
Tools for Deep Frying
- Dutch oven: Heavy enameled cast iron holds its heat when food goes in, so the oil temperature stays steadier.
- Spider strainer: The wide mesh basket and long handle lift food out of hot oil safely and let it drain.
- Instant-read thermometer: Checks the oil temperature between batches and makes sure chicken is cooked through. Read more about choosing a thermometer.
- Wire cooling rack: Set it over a sheet pan so fried food drains and stays crisp.
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Sources: USDA Food Safety (safe cooking temperatures); U.S. Fire Administration (cooking fire safety).
More Cooking Method Guides
Learn how each technique works and when to use it, or start with the types of cooking methods overview:
Moist heat: Poaching · Simmering · Boiling · Steaming · Blanching
Combination heat: Braising · Stewing
Dry heat: Roasting · Baking · Sautéing · Pan Frying · Stir Frying · Deep Frying · Grilling · Broiling · Searing
Biswajit Sengupta says
Can u describe how large batches of French fries are made commercially and how they recycle the used oil
Jessica Gavin says
I don’t know specifically how french fries are commercially manufactured, and each company has its own practices for the oil.