In a bowl take chicken, add salt, black pepper powder, and cornstarch, and mix everything so that the chicken pieces are well coated.
In a pan heat 2 tbsp oil and fry the chicken pieces on medium flame occasionally stirring until crisp and golden on the outside and evenly cooked from the inside (3-4 min). Once done, transfer the chicken onto a plate.
Heat 1 tablespoon of oil in a pan; add garlic and ginger, and sauté on high flame for a few seconds until garlic becomes fragrant.
Add dried red chilies and half of the cut spring onions.
Next, add the fried chicken pieces. Mix well and sauté the chicken on high flame for 1 minute.
Mix all the ingredients given under the sauce, add this to the chicken, and mix.
Make cornstarch slurry by mixing 1 teaspoon cornstarch with 1 tablespoon of water.
Add it to the chicken and cook till the sauce thickens a bit, finally add the rest of the cut spring onion and switch off the flame.
Garnished with dried red chilies, sesame seeds, and chopped green onions if you like.
Serve hot with rice and enjoy.
Notes
Vegetables: You can add vegetables of your choice of broccoli, mushrooms, zucchini, bell peppers (green or red peppers), or carrots to the Mongolian bbq recipe if you want.
Oil: You can use any neutral oil such as vegetable oil in the recipe. However, I recommend using sesame oil for the best flavor.
Don't Overcook: Make sure you cut the chicken into roughly similar size pieces so they cook evenly. Overcooking will make them chewy and rubbery instead of juicy and tender.