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宫保鸡丁Kung pao chicken

Diced chicken, deep-red dried chilies and green pepper in a glossy sweet-sour-salty sauce, with a scatter of roasted peanuts. The clearest example on this site of the wok-heat method at full speed: everything is on the bench before the wok is lit, because once the heat is up, the dish is a matter of seconds between "good" and "burnt."

Origin: Sichuan, from the court of the Viceroy of Sichuan (宫保, "palace protector")
Difficulty: 3 / 5
Servings: 2–3
Prep: 25 min
Cook: 8 min
Total: ~30 min

Technique notes

This is a wok-heat dish at its purest — the chilies and Sichuan peppercorns fry off in hot oil first to release their flavor, and then the chicken, the pepper and the whole sauce come together in about two minutes. The sauce is a sweet-sour-salty balance mixed before the wok is lit — soy for the salt and umami, vinegar for the acid, sugar to round it off, a little cornflour to give it body — because cooking a stir-fry at this speed leaves no time to season in the pan. That balance is what separates "kung pao" from "a bowl of chicken in brown sauce," and the stir-frying order — aromatics first, then protein, then a quick pour of the sauce — is the move that keeps the chicken seared, not steamed. The cut decides it too: everything in even 2 cm pieces, so it all cooks at the same rate and the dish reads as a stir-fry rather than a stew.

Equipment

Wok or 28 cm (11 in) heavy skillet
A small bowl for the sauce, each part measured before it goes in
A small strainer for the coated chicken to sit in while the wok heats

Ingredients

350 g (12 oz) boneless chicken thigh, cut in 2 cm cubes — thigh stays juicy through the fast cook; breast goes rubbery at the same temperature
20 g (1⅓ tbsp) cornflour (cornstarch), 40 ml (2¾ tbsp) cold water, 10 ml (2 tsp) light soy sauce — the coating, mixed together
1 (75 g) long, red dried chilies, seeds out if you want the heat down, cut in 1.5 cm lengths
8 g (1¼ tsp) Sichuan peppercorns, whole — for the oil-fry, and a fresh grind of 3 g on top of the finished dish if you want the má to carry
6 g (1 clove) garlic, sliced thin
15 g (2) spring-onion whites, chopped in 1 cm pieces
50 g (½ cup) green (sweet) pepper and 30 g (2) spring-onion greens, both cut in 2 cm pieces — the green note that answers the heat
40 g (⅓ cup, loosely) roasted peanuts (unsalted, whole), for the finish
For the sauce, mixed in a small bowl before the wok is lit: 15 ml (1 tbsp) light soy sauce · 5 ml (1 tsp) dark soy sauce · 15 ml (1 tbsp) good black vinegar (rice vinegar works) · 12 g (1 tbsp) sugar · 30 ml (2 tbsp) chicken stock · 3 g (⅓ tsp) cornflour
30 ml (2 tbsp) high-heat oil (peanut or peanut-free vegetable)

Method

Coat the chicken. Toss the cubes with the cornflour-and-water-and-soy mix until every piece wears a thin, slightly sticky film. The coating does two jobs: it protects the flesh from the hard heat so the inside stays juicy, and it's what sets into the light glossy sheen on the finished dish. Too thin and it won't hold; more than about the amount here and it sets into a paste. Put the coated chicken in the strainer so the excess runs off.
Build the mise en place. Garlic, spring-onion whites, pepper, spring-onion greens and peanuts each in their own small dish; the sauce mixed and ready in its own bowl; the oil in a cup. Every one of these is a 10–20 second move in the wok, and you won't have more than that between one and the next — this is the stir-fry article's "everything on the bench" rule, and it's the whole difference between a kung pao and a kitchen emergency.
Taste the sauce. It should be aggressive — much stronger than the finished dish, because it thins over the chicken and the vegetables. Work it through the three-seasoning order before the wok is lit: more light soy if it's flat, a little more sugar if the salt is sharp, a few drops of vinegar if the sweet is carrying. This is the balance move, done in a bowl instead of a pan, and it's the only chance you get at it.
Fry the chilies and peppercorns off. A small amount of the oil in the wok or a dry pan, over a medium heat — the chilies go in for 45–60 s, moving them, until they darken to a deep crimson and the oil turns the faintest shade of red. That's the pyrolysis of the chili's oils: the color and the smoke-taste come from the heat itself, not from extra chili. The moment the first black bit appears, tip them out with a slotted spoon and keep the oil — it's now carrying their flavor, and it gets poured back over the dish at the end. The wok-heat article's whole point, in a dish where it's the first move instead of the last one.
The chicken. Wok on a high flame, the rest of the oil in, a thin wisp of smoke the cue. In goes the garlic and the spring-onion whites for 20–30 s until they stop being raw and start to brown — the aromatics-in-hot-fat move. Then the chicken in a single layer, and don't touch it for 30 s: let it sear, not slide. Then toss and cook a further 45–60 s, just until it's white on the outside and a touch raw in the middle. It finishes on the sauce.
Vegetables in, sauce on. In goes the pepper and the spring-onion greens for 30–45 s — bright green, just softened, not gone limp. Pour the sauce in a thin stream down the side of the wok, let it hiss for 10 s, then work it through the lot. The cornflour sets fast at this heat, so the sauce goes from watery to glossy in seconds; once it coats the back of a spoon, it's done. If it looks like it's going sticky, a small pour of the chicken stock loosens it back to a nappe coat — that's the thickening rule again.
Back the chilies, the peanuts, out. The chilies and the chili-oil go back over the top of the lot at the last moment, and a toss; the peanuts in with them, and a quick turn so they pick up the sheen without cooking. Straight out of the wok and onto the plate. A minute or two of extra time here is where the peanuts go soft, the coating goes tacky, and the dish crosses from "good" to "a bit past."
Serve it over rice. A bowl of rice, the kung pao over the top, and the thin glossy sauce runs off the chicken and down onto the grain — that's how it's meant to be eaten. If the má wants to carry, a fresh grind of the Sichuan pepper over the dish is the way to add it: cooked in, it goes bitter; added at the end, it tingles.

Common failures

Chewy, grey, a little greasy. The wok wasn't hot enough when the chicken went in, so it steamed in its own juices instead of searing in the fat. That's step 5's thin wisp of smoke — a properly hot wok first, and the quick 60–90 seconds rather than a slow cook. No amount of sauce at the end brings the lightness back.
Sauce is sticky glue, not glossy sheen. The sauce was poured against a pan that had dropped out of heat, so the cornflour set unevenly. Wok hot, sauce in a thin quick stream, and a small pour of stock to loosen it if it's going too far. Two small pours, or a thin single one — never a big slow glug.
Bitter, astringent note on the chilies. Fried past their window — a minute or two over, and they're done. Step 4: 45–60 seconds at a medium heat, and out the moment the first black spot appears. The color and the pyrolytic note are the goal, never the scorch.
"Just a stir-fry, nothing really there." Most likely the sauce wasn't tasted before it went in, or the chili-oil never went back over the top. The three-seasoning balance (sweet, sour, salt) is the kung pao note, and the chili-oil is the deep warm background — miss either and you're left with a competent stir-fry that isn't quite the dish.

Variations & substitutions

Beef. The same method with 350 g of a lean, slightly fatty cut, the same 2 cm cubes, the same 60–90 second window. The beef gives up more of its own savory note into the coating and the sauce, and the dish reads richer and a little less bright. Same technique, a different protein.
Less heat. Half the chilies (a 40 g piece) keeps the color and a fraction of the burn. The má from the Sichuan pepper is a different kind of heat from the chili's capsaicin — the two are separate levers, and you can turn one down without touching the other.
The Shanghai version. More cornflour in the coating (a full 30 g), a touch more sugar in the sauce, a touch less vinegar — the dish ends up a little richer, a little less sharp. Same move, different balance.

What to serve with it

Rice, first and always — the glossy sauce is built to run off the chicken and down onto the grain. A mapo tofu on the side makes a proper Sichuan table: bright-sweet-sour on one plate, deep-savory-má on the other, and the two of them together cover the whole story. A plate of scallion pancakes is a good second element for the crisp, layered savory note, and a cold lager or a glass of light rice wine (Shaoxing or a pale dry) is the drink that goes with it.

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