1
In a bowl, combine the drained tuna, mayonnaise, chopped red onion, lemon juice, salt, and pepper. Stir until the ingredients are well mixed. Adjust mayo or seasoning to taste.
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2
Butter one side of each slice of bread.
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3
On the unbuttered side of two slices of bread, place a slice of cheddar cheese. Add a layer of the tuna mixture on top of the cheese.
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