Chelo Kebab: Make an Iranian Delicacy at Home

Name: Chelo Kebab: Make an Iranian Delicacy at Home
Ingredients: 2 Onions (coarsely chopped); 2 Garlic Cloves (chopped); 3 tbsp fresh lemon juice; 3 tbsp Olive Oil; ¼ tsp Salt; ¼ tsp black pepper (freshly ground); 600 gm boneless leg of lamb (trimmed and cut into 1-inch cubes); 18 grape tomatoes; Cooking spray; 1½ cups basmati rice; 6 cups Water; 2 tsp Salt; 3 tbsp unsalted butter (melted and divided); 1 tbsp olive oil; ¼ tsp saffron threads (crushed); 2 tbsp Fresh mint (chopped); 2 tbsp Fresh cilantro (chopped)