Grilled Lamb and Beef Koobideh Kebabs

Ingredients (15)

• 1 medium yellow onions
• 1 ⁄2 lb ground lamb
• 1 ⁄2 lb ground sirloin
• 4 cloves garlic
• 1 egg
• 1 ⁄4 cup dry bread crumbs
• 2 tbsp finely chopped parsley
• 2 tsp salt
• 1 ⁄2 tsp freshly ground black pepper
• 1 tsp ground turmeric
• 1 tsp paprika
• 1 pinch saffron threads
• 1 tbsp. butter
• Ground sumac
• 1 lemon