In a medium mixing bowl, combine the well-drained canned tuna and mayonnaise. Stir in finely chopped fresh herbs, like parsley or dill, along with a pinch of salt. Mix until smooth and well blended.

Take two slices of bread. Spread a generous amount of the creamy tuna mixture onto one slice. Sprinkle a generous layer of shredded cheese over the tuna and top with the second slice.

Heat a skillet over medium heat and add a tablespoon of unsalted butter. Once sizzling, place your sandwich in the skillet and cook for 3-4 minutes until the bottom is golden brown. Carefully flip and cook for another 3-4 minutes.

Remove the sandwich once both sides are golden and the cheese is melted. Slice in half and serve hot with a salad or tomato soup.