How to Stir-Fry (Heat, Batches, and Order of Ingredients)

To stir-fry, cut food into small, even pieces, prep every ingredient before you turn on the heat, then cook in a very hot wok or skillet in small batches while tossing constantly: meat first, then vegetables, with aromatics and sauce added in the final minute. The whole cook takes 5 to 10 minutes, which is why the prep matters more than the cooking.

The science: heat flux beats heat setting

Stir-frying is about how fast the pan can push heat into food, not just how hot the dial is. When cold, wet ingredients hit metal, they pull heat out of it. If the metal drops below about 100 °C / 212 °F, the water coming out of the food can no longer flash off. It pools, and your stir-fry becomes a braise.

Browning needs surface temperatures closer to 140 °C / 285 °F and up, where the Maillard reaction runs quickly. So the job is to keep the metal far above the boiling point the entire time.

Three factors decide whether you win:

• Stored heat. A wok preheated to 230 to 260 °C / 450 to 500 °F has a heat bank to absorb the shock of cold food.
• Burner power. Home gas burners typically put out roughly 2.5 to 4.5 kW (about 8,000 to 15,000 BTU/h). Restaurant wok burners can be five to ten times that. At home, you make up the gap with smaller batches.
• Load. Roughly 225 to 340 g (1/2 to 3/4 lb) of food per batch in a 35 cm (14 in) wok on a home stove. In a 30 cm (12 in) skillet, aim smaller.

Constant tossing matters for a different reason. Each piece touches the hottest metal for a moment, browns a little, then lifts away before it can scorch. Over a few minutes, every surface gets dozens of short, intense hits of heat.

What wok hei actually is

Wok hei, often translated as "breath of the wok," is the smoky, slightly charred aroma of a restaurant stir-fry. It comes from a mix of very rapid browning, a little caramelization of sauces on the hot metal, and tiny droplets of oil vaporizing and briefly igniting as food is tossed through the flame. A home kitchen cannot fully reproduce the flame effect, but a properly preheated carbon steel wok, small batches and fast tossing get you real smoky edges.

Choosing the pan and oil

A thin carbon steel wok heats and recovers fast and develops a nonstick patina with use. A flat-bottomed wok sits better on electric and induction tops. A heavy 30 cm (12 in) cast iron or carbon steel skillet is a solid stand-in; it just has less side room for tossing.

Use an oil with a smoke point above about 220 °C / 430 °F: peanut, canola, refined avocado, rice bran or generic vegetable oil. Toasted sesame oil burns easily and belongs at the end as a seasoning, not as the cooking fat. See smoke point for details.

Prep like a line cook

Mise en place is not optional here. Once the wok is hot, there is no time to mince garlic.

• Slice meat about 5 mm (1/4 in) thick, against the grain. For extra tenderness, velvet the meat first.
• Cut vegetables to cook in the same time: dense ones like carrots and broccoli stems thinner, soft ones like peppers and snow peas larger.
• Dry everything. Spin washed greens and pat meat dry.
• Mix the sauce in a bowl with the thickener already stirred in. A typical ratio is 3 tablespoons soy sauce, 2 tablespoons Shaoxing wine or stock, 1 teaspoon sugar and 1 teaspoon cornstarch.

Steps

1. Cut everything into small, even pieces and pat it dry. Bite-size pieces, roughly 1 to 2 cm (1/2 to 3/4 in) or thin strips, cook through before they burn.
2. Mix the sauce and line up every ingredient by the stove. Arrange them in cooking order: meat, firm vegetables, tender vegetables, aromatics, sauce, garnish.
3. Heat the empty wok over high heat until it just begins to smoke. This takes 2 to 4 minutes on most home burners. A drop of water should bead and skitter, then vanish in about a second.
4. Add oil, swirl to coat, and sear the meat in small batches, then set it aside. Use about 1 tablespoon (15 mL) oil per batch. Spread the meat in one layer and leave it for 30 to 60 seconds to brown before tossing. Pull it while still a touch pink; it finishes later.
5. Add firm vegetables first, then quicker-cooking ones, tossing constantly. Carrots, broccoli and onions go in first for 1 to 2 minutes; peppers, snow peas and bok choy for the last minute. If dense vegetables need help, add 1 to 2 tablespoons of water and let it steam off.
6. Push the vegetables aside and fry the aromatics for 15 to 30 seconds. Garlic, ginger and chili go into a little oil in the cleared centre until fragrant. Any longer and garlic turns bitter.
7. Return the meat, add the sauce at the edge, and toss until glossy. Pouring sauce down the hot side of the wok sizzles and reduces it instantly. The cornstarch thickens in 20 to 40 seconds once it passes about 70 °C / 160 °F.
8. Serve immediately. Steam keeps cooking the vegetables on the plate, and crisp edges soften within minutes.

Chef Fizz says: If the sizzle ever goes quiet, your pan just lost the fight. Scoop half out and cook it in two rounds.

Common mistakes and fixes

• Soggy, grey food: the pan is overloaded or underheated. Cook in batches and let the wok reheat for 30 to 60 seconds between them.
• Meat sticking: the wok was not hot enough, or you moved the meat too soon. Wait for a brown crust; it releases on its own.
• Burnt garlic: it went in too early. Add aromatics in the last minute, not at the start.
• Watery sauce: no thickener, or vegetables dumped their juices. Use a cornstarch slurry and dry your produce.
• Tough meat: it was overcooked during the first sear. Undercook it slightly, since it returns to the pan at the end. For chicken, check that the thickest piece reaches 74 °C / 165 °F before serving.
• Smoke alarm: use a higher smoke point oil and turn on the hood before you start. Some smoke from the dry wok is expected.