Step 1:
Cut the boneless chicken thighs into 1 inch pieces.
Step 2:
Marinate the chicken pieces with soy sauce, grated garlic and salt.
Step 3:
Toast sichuan peppercorns for 2 minutes on low flame. Crush them along with black peppercorns to a coarse powder using pestle and mortar.
Step 4:
In a bowl, add the ingredients written under 'sauce'. Mix and keep it ready.
Step 5:
In a frying pan, add a cup of any neutral oil and heat it.
Step 6:
In a plate, add corn flour. Roll the chicken pieces in corn flour and deep fry them on medium-high flame to crispy-golden brown. Transfer them to a plate lined with kitchen towel. Fry the chicken pieces in 2-3 batches. Do not overcrowd the pan.
Step 7:
Take a large frying pan or wok, add a tablespoon of oil, let it heat up. Now add in onion and pepper cubes. Sauté for 2 minutes.
Step 8:
Add in the prepared sauce and fried chicken and mix thoroughly to coat each chicken piece with the sauce. Switch off the flame. Sprinkle with some more pepper mix (1/4 tsp) and enjoy!