Chop the fish meat.
Add salt, black pepper and mustard paste in the meat.
Also add lemon juice and garlic paste.
Leave it to marinate for an hour.
Now beat an egg and dip fish pieces in it.
Then coat the fish meat in bread crumbs.
Add oil in a pan and heat it for a while.
Fry the fish pieces on low heat for 8-9 minutes.
For Tartar Sauce: Mix mayonnaise, pickled cucumber and pickled onions.
To Assemble Fish Burger: Warm the burger buns on a pan.
Now apply tarter sauce on the burger buns.
Place lettuce leaf and fried fish chunks on buns.
Place a cheese slice, onion rings and tomato slices.
Place another bun on top of cheese slice.