Finely chop the tuna with a chef's knife. Place tuna in a bowl and mix in lemon, onion, parsley, relish, bread crumbs and eggs until well combined. Season with salt and pepper. Shape tuna mixture into 6 round patties. Brush both sides of tuna burgers with vegetable oil and season again with salt and pepper. Cook the tuna burgers in a non stick skillet over medium heat for 5 minutes each side until they are cooked through.
Serve on hamburger buns with whatever you fancy. Some suggestions are cheese, lettuce, tomato, pickles, mustard, ketchup and barbecue sauce.
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