In a big bowl season the chicken pieces with sesame oil, sherry (or white wine), Chinese 5 spices, ¼ tsp black pepper, and ½ tsp salt. Let it marinate for 10 minutes.
Add, to the same bowl, the beaten egg and the cornstarch and mix until you get a tick batter covering the chicken pieces.
In a frying pan add enough canola oil to cover half of the chicken. Fry until the chicken pieces start to get slightly golden and then flip them to get it evenly cooked. When the chicken is done remove it from the oil and take it to a plate with some absorbent paper towel.
In a saute pan add 1 tbsp of canola oil and saute the chili pepper --- cut into small cubes ---, the garlic cloves and the ginger paste for 1 minute until slightly brown.
Toss the chicken, ¼ tsp black pepper, and ½ tsp salt and cook for 3 minutes until the chicken pieces are coated with the rest of the ingredients. Serve.