In a large bowl, combine the ground lamb, ground chicken, ground beef, finely chopped red onion, minced garlic, chopped parsley, cumin powder, paprika, salt, and black pepper. Mix well until all ingredients are fully incorporated.

Shape the Kebabs

Divide the mixture into equal portions and shape each portion onto skewers, forming long kebabs. If using wooden skewers, soak them in water for 30 minutes to prevent burning.

Marinate the Vegetables

In a separate bowl, toss the bell pepper chunks and sliced zucchini with olive oil, salt, and pepper. Let them marinate while you prepare the grill.

Grill the Kebabs and Vegetables

Preheat the grill to medium-high heat. Grill the kebabs for about 10-12 minutes, turning occasionally, until fully cooked. At the same time, grill the marinated vegetables for about 5-7 minutes until tender and slightly charred.

Prepare the Serving

On a large platter, arrange the grilled kebabs and vegetables. Serve with warm pita bread and a side of soup of your choice.