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In a bowl, mix together tuna, mayonnaise, relish (you can adjust amounts of mayonnaise and relish depending on your preference), salt and pepper.
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Heat small nonstick pan on medium heat.
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Butter one side of bread and place onto pan.
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Add half of the tuna melt mixture to the slice of break in the pan, add slice of cheddar cheese, and then top with another slice of buttered bread.
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When the bottom slide of bread is nice and golden, gently flip sandwich over to toast the other side until fully toasted.
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Repeat for second sandwich.