Make the yogurt sauce by combining yogurt, 1/4 tsp. minced garlic, dill, juice from half of the lemon and salt
Stir all the above ingredients to combine and then refrigerate to allow the flavours to blend
Roughly chop the spinach, sun dried tomatoes and 1/4 of the red onion
In a bowl combine ground turkey with spinach, sun dried tomatoes, red onion, feta, 1/2 tsp. minced garlic, oregano, egg, bread crumbs, 1/2 tsp. salt and pepper
Stir everything until it is evenly combined. Shape the mixture into 6 patties
Cook the burgers on a grill, non-stick skillet or open flame
Spread the yogurt sauce on both sides of a bun, add warm burger and top with thin slices of red onion and cucumber