Step 1

Preheat a large cast iron skillet or heavy bottomed saucepan over medium-low heat.

Step 2

Butter one side of each slice of bread. The buttered sides of the bread will be the outside of the sandwiches. Flip two slices of bread over so the butter sides are down. Spread the unbuttered sides with tuna salad. Arrange cheese on top of the tuna salad, then top with another slice of bread, buttered-side out.

Step 3

Place the sandwiches in the skillet and cook for about 2-3 minutes or until the undersides are golden brown. It's best to toast these slowly. So keep a close eye on the underside, and lower the heat if needed. Flip the sandwiches, and cook until the cheese is melted and the second sides are golden brown.

Step 4

Serve immediately while warm and crisp.