01 - Wrap the grated cucumber in a clean kitchen towel and squeeze firmly to remove excess moisture. In a mixing bowl, combine the Greek yogurt, drained cucumber, minced garlic, fresh dill, lemon juice, olive oil, salt and pepper. Stir until smooth and well blended. Cover and refrigerate to allow the flavors to meld while you prepare the meatballs.
02 - In a large bowl, combine the ground turkey, breadcrumbs, egg, minced garlic, grated onion, chopped parsley, chopped mint, dried oregano, ground cumin, salt and pepper. Gently fold the mixture with your hands until just combined, being careful not to overwork the meat.
03 - Using your hands, roll the mixture into 18 to 20 uniform walnut-sized meatballs, approximately 1.5 inches in diameter. Place them on a plate or tray as you work.
04 - Heat the olive oil in a large nonstick skillet over medium heat. Add the meatballs in batches without crowding the pan. Cook for 8 to 10 minutes, turning every couple of minutes, until golden brown on all sides and cooked through to an internal temperature of 165°F.
05 - Preheat the oven to 400°F. Arrange the meatballs on a parchment-lined baking sheet and brush or spray lightly with olive oil. Bake for 15 to 18 minutes, turning halfway through, until golden brown and cooked through.
06 - Arrange the meatballs on a serving platter with a generous dollop of tzatziki sauce alongside. Garnish with fresh herbs and lemon wedges. Serve with warm pita bread or a crisp side salad if desired.