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In a medium bowl, flake the drained tuna with a fork. Add the chopped fresh spinach, mayonnaise, Dijon mustard, lemon juice, minced red onion, chopped celery, salt, and black pepper. Mix well until all ingredients are thoroughly combined.

Lay out the 8 slices of sourdough bread. Spread a generous amount of the tuna and spinach mixture evenly over 4 of the bread slices.

Place one slice of provolone cheese on top of the tuna mixture on each of the 4 bread slices. Top with the remaining 4 slices of bread to form sandwiches.

Butter one side of each sandwich. Heat a large non-stick skillet or griddle over medium heat. Once hot, place the sandwiches butter-side down in the skillet. Cook for 3-5 minutes, or until the bread is golden brown and crispy.

While the first side is cooking, butter the top side of each sandwich. Flip the sandwiches and cook for another 3-5 minutes, or until the second side is golden brown and the cheese is melted and bubbly.

Remove the zesty spinach and tuna melts from the skillet, slice in half if desired, and serve immediately.


In a medium bowl, flake the drained tuna with a fork. Add the chopped fresh spinach, mayonnaise, Dijon mustard, lemon juice, minced red onion, chopped celery, salt, and black pepper. Mix well until all ingredients are thoroughly combined.

Lay out the 8 slices of sourdough bread. Spread a generous amount of the tuna and spinach mixture evenly over 4 of the bread slices.

Place one slice of provolone cheese on top of the tuna mixture on each of the 4 bread slices. Top with the remaining 4 slices of bread to form sandwiches.

Butter one side of each sandwich. Heat a large non-stick skillet or griddle over medium heat. Once hot, place the sandwiches butter-side down in the skillet. Cook for 3-5 minutes, or until the bread is golden brown and crispy.

While the first side is cooking, butter the top side of each sandwich. Flip the sandwiches and cook for another 3-5 minutes, or until the second side is golden brown and the cheese is melted and bubbly.

Remove the zesty spinach and tuna melts from the skillet, slice in half if desired, and serve immediately.
