Make black pepper sauce
In a large bowl whisk together soy sauce, rice vinegar, black pepper, toasted sesame oil, cornstarch and chicken stock or water until smooth texture.
Coat chicken with 1 Tbsp of the sauce, salt and 2 Tbsp of cornstarch. Set aside.
In a large skillet add 1-2 Tbsp oil on medium heat.
Cook chicken until golden brown on both sides. Set aside on a plate.
In the same pan add 1 Tbsp oil. Add garlic, ginger and chill pepper. Saute for 30 seconds.
Add onions and bell peppers. Stir fry over high flame until veggies are created crispy and tender.
Reduce heat to low and whisk in sauce. Let simmer for 30 seconds.
Return chicken and toss until combined well.
Turn off heat add black pepper if needed, stir and serve over Jasmine Rice.