Preheat air fryer to 360 degrees F.
Prepare tartar sauce by adding mayo, fresh dill, sweet relish, lemon zest, black pepper, and lemon juice into a bowl and whisk until fully combined. Some of the relish might sink to the bottom, so you'll need to make sure to whisk it up enough. Set it fridge until ready to eat.
Add four Gorton's Beer Battered Fish Fillets to the air fryer and cook for 10-12 minutes. If you aren't using an air fryer, follow package instructions to bake your fish fillets.
While fish is cooking, prepare your sandwich toppings. Slice your onions and tomato and toast buns, if desired.
Once the fish is ready, slather on a dollop of tartar sauce then top with veggies and fish! Enjoy these addicting mini sandwiches!
