I slathered the bottom of the bun with a tartare sauce,placed the fish and onion on top of the tartare sauce and topped with lettuce and a little more tartare sauce.Nice easy tasty fish sandwich. You can also either bake or broil the fish in the oven.
1C mayonnaise1Tbs finely chopped onion
1-2 Tbs finey chopped dill pickles or to taste1 Tbsp chopped capers
a small garlic clove grated
mix all the ingredients together. Thin a little with either the dill pickle juice or caper brine to taste.
You can also mix in some chopped parsley or cilantro.