Prepare the vegetables by dicing the Roma tomato, slicing the green onions, and shredding the butter lettuce.

Mash the hard-boiled eggs in a mixing bowl, then mix in the diced tomatoes, shredded lettuce, sliced green onions, mayonnaise, salt, and pepper.

Spread butter on one side of each slice of bread.

Assemble the sandwiches by placing the egg salad filling on the buttered side of one slice and topping it with another slice, buttered side facing up.

Trim the crusts and cut the sandwiches into triangles for serving.

Serve fresh with tea or coffee, along with sides like chips or crisps.