I've never had a tuna sandwich that good! Sandwich recipe with canned tuna.

What do I need to make this tuna sandwich?
Onion, 1 tbsp.
Red pepper, 1 tbsp.
Pickled gherkins or olives, 1 tbsp.
Parsley, coriander, or basil, 1 tablespoon.
1 boiled egg.
Canned tuna, 200 g.
Mayonnaise, 2 tablespoons.
Fresh tomato
Cheddar cheese.
Melted butter or oil.

Sandwich bread.

Hope you enjoy your sandwich.
Thanks!