In a bowl, combine the drained tuna with the minced red onion, garlic, egg, breadcrumbs, dill, lemon juice, salt, and black pepper.
Form the mixture into 4 equal-sized tuna patties and refrigerate for 15 minutes to firm up.
In a hot skillet or on a grill, cook the tuna patties in a little olive oil for 3-4 minutes on one side, then flip and cook for another 3-4 minutes, or until golden brown and cooked through.
Halve the hamburger buns and lightly butter them. Toast them in a skillet until golden brown.
Spread mayonnaise and Dijon mustard on the bottom bun, then add a lettuce leaf.
Place the tuna patty on top of the lettuce, then add the tomato slices and cucumber.
Spread a little extra mayonnaise on the top bun before closing the burger.
Serve immediately with a fresh salad or sweet potato fries.
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