Shish Kebab

Ingredients

• 1 3⁄4 lb. lamb shoulder, cut into 1″ cubes
• 3 tbsp. extra-virgin olive oil
• 1 tbsp. tomato paste
• 1 tbsp. minced fresh thyme
• 1⁄2 tsp. paprika
• 1⁄4 tsp. cayenne pepper
• 1⁄4 tsp. ground allspice
• 1⁄4 tsp. ground cinnamon
• 1⁄4 tsp. ground cumin
• 3 cloves garlic, minced
• Kosher salt
• freshly ground black pepper
• 1 medium yellow onion, thinly sliced
• 1 tbsp. ground sumac
• 24 cherry or grape tomatoes