In a bowl, add water ,salt, vinegar green chili paste and mix well.
Add chicken pieces & dip properly and marinate for 4-5 hours.
In a bowl, add marinated chicken, red chili powder, garlic powder, salt, black pepper powder, baking powder, mustard powder, soy sauce, chili sauce, mix well and marinate for 30 minutes.
In one bowl, all-purpose flour & add water in another bowl.
Now coat marinated chicken pieces in all-purpose flour then dip into water & again coat in all-purpose flour.
In a wok,heat cooking oil (155 C) and fry chicken pieces on low flame until golden & crispy (10-12 minutes).
Serve with bun & potato fries!