01 - Wrap the grated cucumber in a clean kitchen towel and squeeze firmly to remove excess moisture. Combine the drained cucumber with Greek yogurt, minced garlic, fresh dill, lemon juice, extra-virgin olive oil, salt, and pepper in a mixing bowl. Stir until smooth and well blended. Cover and refrigerate to allow the flavors to meld while preparing the meatballs.
02 - In a large mixing bowl, combine the ground turkey, breadcrumbs, egg, minced garlic, grated onion, chopped parsley, chopped mint, dried oregano, ground cumin, salt, and black pepper. Gently fold the mixture with your hands until evenly combined, being careful not to overwork the meat.
03 - Portion the mixture into 18 to 20 uniform walnut-sized balls, rolling each gently between your palms. Place the shaped meatballs on a tray or plate as you work.
04 - Heat olive oil in a large nonstick skillet over medium heat. Working in batches to avoid crowding, add the meatballs and cook for 8 to 10 minutes, turning regularly, until deeply 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 fully cooked.
06 - Arrange the cooked meatballs on a platter and garnish with fresh herbs. Serve with a generous dollop of chilled tzatziki sauce, lemon wedges, and warm pita bread or a crisp side salad alongside.