In a medium-size bowl, beat the eggs and lemon juice with a fork until the eggs break and the mixture is watery.
 Pour in the Parmesan cheese and breadcrumbs into the egg mixture. Mix with a spoon until the mixture resembles a pasta-like substance., Fold in the diced onion and tuna into the mixture. Stir well until mixture is creamy and slightly thick. Season with a desired amount black pepper. Mix., Using your hands, pick a tablespoon amount of the tuna mixture and roll it out in a ball. Flatten it slightly to form a burger patty. Lay it on a tray. Repeat until there is no more tuna., Cover the tray with plastic wrap and place it in the fridge to chill. Have the burgers chill for about an hour, until they slightly thicken., Put the stovetop onto medium heat and lay a frying pan or skillet on the heat. Sprinkle olive oil over the pan., Place the tuna burgers on the frying pan or skillet. Have them cook for about five minutes on both sides, making sure both sides are golden brown and crispy., Using a spatula, remove the tuna burgers from the heat. Place burgers on buns and add any desired toppings such as ketchup, mustard, ranch, lettuce, shredded carrots, chopped cucumbers, sliced avocado, and/or grilled onions., Place a tuna burger on a serving plate to eat. Serve with a glass of your favorite beverage. Enjoy!
Beat the eggs and lemon juice.
Add the cheese and breadcrumbs.
Add onions and tuna.
Shape the tuna mixture into patties.
Have the burgers chill.
Preheat the stovetop.
Fry the tuna burgers.
Place the tuna burgers on buns.
Serve and enjoy!
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