Chef John's Cashew Chicken

1 . Stage

Season chicken cubes with salt and black pepper.

2 . Stage

Mix water and cornstarch in a bowl until smooth; whisk in lemon juice, rice vinegar, ketchup, soy sauce, brown sugar, and chile pepper sauce into cornstarch mixture, stirring until brown sugar has dissolved and cornstarch is free of lumps.

3 . Stage

Place a heavy skillet over medium-high heat; pour in vegetable oil. Add slices of red chile and ginger to the hot oil. Cook, stirring often, until oil is flavored, about 2 minutes. Stir in cashews and garlic; cook until cashews are lightly golden brown, about 2 minutes more.

4 . Stage

Lightly toss seasoned chicken cubes with cashew mixture in skillet until combined, about 30 seconds. Turn heat down to medium-low and pour cornstarch mixture into the skillet. Stir constantly until sauce has thickened, about 30 seconds. If too thick, add a splash of water. Simmer 2 more minutes to heat the chicken through.

5 . Stage

Adjust levels of salt, black pepper, soy sauce, and chile pepper sauce to taste. Stir in cilantro just until wilted, about 15 seconds.