Take chicken breast and make 4 fillets, pound fillets with steak hammer.
In bowl,add vinegar,mustard paste,garlic powder,white pepper powder,red chilli powder, worcestershire sauce and salt,mix well.
Add fillets and coat fillets properly,marinate it for 30-45 minutes.

For flour coating, combine flour,red chili powder,black pepper,garlic powder,salt,corn flour and rice flour, mix well and set aside.
For egg coating, in a bowl beat 2 eggs with milk and set aside.

Heat oil in a wok, take one marinated chicken fillet, dip into egg mixture and coat it with flour mixture then again dip into egg mixture and flour mixture (press hard for crispy fillet).
Deep fry the fillet on medium flame, fry 3 minutes each side. Fry until a crispy coat is turned brown.
Repeat same process with all the fillets.

To make mayo sauce, combine chili garlic sauce, mustard paste and mayonnaise and mix well to form a paste. Pour mayo sauce in dressing bottle.

For assembling, take burger buns. Apply mayonnaise on bun. Add iceberg leaf, fried chicken fillet, mayo sauce and then cover with the bun.
Serve with homemade French fries and ketchup.