Green Onion Tuna Sandwich

Wash the green onion thoroughly and slice it thinly.

Drain the oil from the canned tuna and set aside.

In a bowl, combine the tuna and green onion with mayonnaise, salt, and pepper, and mix well.

Spread butter evenly over one slice of bread.

Place the tuna and green onion mixture on top of the bread, then cover with another slice of bread.

Cut the sandwich into bite-sized pieces.