Black Pepper Chicken (Paleo, Whole30 + Keto)

sesame oil, divided

lbs boneless chicken breasts or thighs, cut into bite-sized pieces

bell pepper, sliced into thin strips

shallot, diced

ribs celery, thinly-sliced on a diagonal

garlic, minced

fresh ginger, grated on a microplane

coconut aminos

Bob's Red Mill arrowroot starch

fish sauce

white vinegar

freshly-ground black pepper ((must be freshly ground))

red chili flakes (optional topping)

sliced green onions (optional topping)

chopped cashews (optional topping)