Marinate 6 chicken thigh pieces with 1 tbsp vinegar, 1 tbsp mustard paste, ½ tsp black pepper powder, ½ tsp chili powder and 1 tsp ginger garlic paste.
Keep aside for 30 minutes.
Now put marinated chicken in a pan with 1 cup water. Cover and cook till water dries and chicken is tender.
In a bowl mix together 1 egg, ½ cup flour and chilled water as required. Make thick batter.
Now dip chicken in prepared batter, coat with bread crumbs and deep fry till golden brown.