slices. Core, seed and slice the red bell pepper lengthwise into 1 cm strips. Set a wok or large skillet over high heat. Add the chili oil and 1 tablespoon of the remaining sesame oil and heat the oil for about 1 minute, until ripples appear on the wok bottom. Add the onion and red pepper and stir-fry the mixture for 1 minute. Cover the wok and allow the mixture to steam for 1 minute. Using a slotted spoon, remove the vegetables from the wok to a heatproof plate. Add the remaining sesame oil to the wok, pour in the chicken and marinade, and stir-fry over high heat for 2 minutes. Blend in the cornstarch mixture, stirring it for about 1 minute, until the sauce has thickened and becomes clear. Return the vegetables to the wok, toss the mixture lightly for about 30 seconds, and serve. Accompany the chicken with fluffy boiled rice.