Chicken Tikka Masala

Name: Chicken Tikka Masala
Prep time: 15 min
Cook time: 15 min
Total time: 30 min
Cuisine: Indian
Ingredients: 2 lbs. boneless skinless chicken breasts; 1/4 cup masala paste (recipe follows); 1/2 cup plain yogurt; 1-2 tablespoons oil; 2 cups tomato puree; 1 cup heavy cream (sub a 14-ounce can of regular coconut milk); 1-2 teaspoons kosher salt; rice and cilantro for serving; 2 onions (about 3 cups when chopped); 5 cloves garlic; a 2-inch piece of fresh ginger; 3 tablespoons garam masala; 1 tablespoon each chili powder, turmeric, and cumin; 1/2 teaspoon ground cloves; 2 teaspoons kosher salt; ½ teaspoon cayenne pepper; a small pile of cilantro stems; juice of one lemon