Marinate chicken with 2 tbsp soy sauce, 1 tbsp black pepper, 2 tsp corn starch for 30 minutes.
In wok with oil, fry onions, garlic for 2 minutes.
Add chicken and fry for 3-5 minutes until color changes.
Add vegetables: bell peppers, celery, lychee and mix.
Add 1 tbsp black pepper, sugar, ketchup, 2 tbsp soy sauce.
Add chicken broth and corn starch slurry.
Simmer for 10-15 minutes until sauce thickens and chicken is completely cooked.
Sprinkle spring onions as garnish