In a bowl,combine together all the ingredients listed under 'for marination' along with the chicken pieces.Set aside for atleast 20 minutes.
Meanwhile ,in a mixing bowl combine together all the ingredients listed under 'for Mayo sauce'.Set aside until required.
Just before frying the chicken,add the all pupose flour ,cornflour and egg and mix well to coat the pieces evenly.
Heat oil in a pan and deep fry the chicken over medium flame,turning once or twice in between until it is cooked through and turns golden brown.Drain onto a kitchen towel.
Allow to cool sightly,add the fried chicken to the mayo sauce and mix to coat evenly.Serve immediat.