Crispy Fish Burger

Ingredients
'""""""""""""""""""''
Egg 1
Salt 1/2 tsp or to taste
Black pepper power 1 tsp
red chilli flakes 1/2 tsp
mustard paste 1 tsp
vinegar 1-2 tbsp
All-purpose flour (maida) 2 tbsp
cornflour 1 tbsp
rice flour 1 tbsp
Carom seeds (Ajwain) 1/2 tsp
Red chilli powder 1/2 tsp
finger Fish 1/2 kg
breadcrumbs
oil for fry
butter
red chilli powder 1/8 tsp(optional)
fresh Coriander leaves
long burger bun
mayonnaise
lettuce
tikka mayonnaise
pickled gherkins(optional)