Sauté the Aromatics: Chop the red chili, onion, leeks, and garlic. Set the temperature to medium-low. Add the ingredients to a wok with grapeseed oil. Sauté until the aromatics have caramelized, which should take five to eight minutes.
The Chicken: Thoroughly wash the chicken breast and slice it into cubes. Add lemon juice and set aside for five minutes. If using ground chicken, skip this step. Add the chicken to the wok and add the soy sauce, fish sauce, brown sugar, and oyster sauce. Add a piece of black pepper as well.
Simmer: Add a little bit of water (approximately 5 tbsp). After the chicken has cooked, the marinade should turn from light brown to dark brown. Add the Thai basil leaves.