1. Make the Kofta: Preheat the grill to medium-high heat. In a large bowl, combine ground turkey, minced onions & garlic, parsley, chopped oats, cumin, coriander, sumac (if using), salt, pepper, cinnamon, allspice, and cloves. Use clean hands to knead the mixture until well combined. Divide into 8 equal portions and shape into 3-inch sausage-like logs. Thread onto metal skewers. Oil the grill grates by dragging a paper towel soaked in oil across the grates using tongs just before grilling. Grill kofta skewers for 9–13 minutes, turning once, until internal temperature reaches 165°F. Let rest for 4–5 minutes before serving.
2. Make the Salad: While the kofta grills, combine cucumber, tomato, onion, parsley, mint, olive oil, and lemon juice in a mixing bowl. Season to taste with salt and pepper. Toss well and chill until ready to serve.
3. Make the Yogurt Sauce (Optional): In a bowl, whisk together yogurt, olive oil, lemon juice, grated garlic, and salt. Stir in grated cucumber. Add water 1 tablespoon at a time to thin to your desired consistency. Taste and adjust seasoning as needed.