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In a medium bowl, combine the drained and flaked tuna, mayonnaise, finely chopped celery, finely chopped red onion, Dijon mustard, fresh lemon juice, chopped fresh dill, salt, and freshly ground black pepper. Mix gently until all ingredients are well combined.

Preheat a large skillet or griddle over medium-low heat. Ensure the surface is evenly heated.

Butter one side of each slice of sourdough bread generously. This will create a golden, crispy crust.

Assemble the sandwiches: Place 4 slices of bread, butter-side down, onto a clean surface. Layer each with half of the shredded sharp cheddar cheese, then a generous portion of the tuna salad, followed by the remaining half of the Gruyere cheese. Top with the remaining 4 slices of bread, butter-side up.

Carefully transfer the assembled sandwiches to the preheated skillet or griddle. Cook for 4 to 6 minutes per side, or until the bread is golden brown and crispy, and the cheese is thoroughly melted and gooey. Adjust heat as necessary to prevent burning.

Remove the gourmet tuna melts from the skillet, slice them in half diagonally, and serve immediately while hot.


In a medium bowl, combine the drained and flaked tuna, mayonnaise, finely chopped celery, finely chopped red onion, Dijon mustard, fresh lemon juice, chopped fresh dill, salt, and freshly ground black pepper. Mix gently until all ingredients are well combined.

Preheat a large skillet or griddle over medium-low heat. Ensure the surface is evenly heated.

Butter one side of each slice of sourdough bread generously. This will create a golden, crispy crust.

Assemble the sandwiches: Place 4 slices of bread, butter-side down, onto a clean surface. Layer each with half of the shredded sharp cheddar cheese, then a generous portion of the tuna salad, followed by the remaining half of the Gruyere cheese. Top with the remaining 4 slices of bread, butter-side up.

Carefully transfer the assembled sandwiches to the preheated skillet or griddle. Cook for 4 to 6 minutes per side, or until the bread is golden brown and crispy, and the cheese is thoroughly melted and gooey. Adjust heat as necessary to prevent burning.

Remove the gourmet tuna melts from the skillet, slice them in half diagonally, and serve immediately while hot.
