01 - Squeeze excess moisture from the grated cucumber using a clean kitchen towel or cheesecloth. Combine the Greek yogurt, drained cucumber, minced garlic, fresh dill, lemon juice, extra-virgin olive oil, salt, and pepper in a mixing bowl. Stir until smooth and fully incorporated. Refrigerate until ready to serve for the best flavor development.
02 - In a large mixing bowl, combine the ground turkey, breadcrumbs, egg, minced garlic, grated onion, fresh parsley, fresh mint, dried oregano, ground cumin, salt, and black pepper. Mix gently until just combined, being careful not to overwork the mixture.
03 - Roll the turkey mixture into 18 to 20 uniform walnut-sized meatballs, approximately 1.5 inches in diameter. Ensure even sizing for consistent cooking.
04 - For pan-frying: heat olive oil in a large nonstick skillet over medium heat. Add meatballs in batches and cook for 8 to 10 minutes, turning regularly, until golden brown on all sides and cooked through to an internal temperature of 165°F. For baking: preheat oven to 400°F. Arrange 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 and fully cooked.
05 - Arrange the cooked meatballs on a serving platter with a generous dollop of tzatziki alongside. Garnish with fresh herbs and lemon wedges. Serve with warm pita bread or a crisp side salad if desired.