Lamb Kofta Kebabs

Name: Lamb Kofta Kebabs
Ingredients: ½ smaller-sized yellow onion (peeled, trimmed, and cut into chunks); 3 garlic cloves; ¼ cup pine nuts; ¼ cup parsley leaves and thin stems (packed plus extra for garnish); ½ teaspoon ground cumin; ¼ teaspoon cinnamon; ¼ teaspoon ground cardamom; ¼ teaspoon ground coriander; ½ teaspoon allspice; Freshly ground black pepper (to taste); ¾ lb. ground lamb; ½ tablespoon ghee; 1 teaspoon Kosher salt; Avocado oil spray; Tahini Sauce (to taste, recipe below); Amba (optional sauce, as needed)