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Instructions
Gather all ingredients.
Beat eggs and lemon juice in a bowl; stir in bread crumbs and Parmesan cheese to make a paste. Fold in tuna and onion until well combined; season with black pepper.
Use your hands to shape tuna mixture into 8 (1-inch-thick) patties.
Heat vegetable oil in a skillet over medium heat. Fry patties in the hot oil until golden brown, about 5 minutes per side.