01 - In a large bowl, gently mix ground lamb, diced red onion, minced garlic, parsley, mint, oregano, cumin, smoked paprika, salt, black pepper, and 2 oz crumbled feta until just combined without overworking.
02 - Divide the mixture into 4 equal portions and shape each into a patty approximately ¾ inch thick.
03 - Preheat a grill or skillet to medium-high heat and lightly oil the surface.
04 - Cook patties for 5 to 6 minutes per side until browned and cooked through to an internal temperature of 160°F for medium doneness.
05 - Optionally, lightly toast the burger buns to enhance texture.
06 - Layer each bottom bun with lettuce, a lamb patty, sliced tomato, red onion, extra crumbled feta, and a spoonful of tzatziki or Greek yogurt before topping with the bun.
07 - Serve immediately alongside preferred side dishes.