Makhani - Indian Butter Chicken

Name: Makhani - Indian Butter Chicken
Prep time: 30 min
Cook time: 1 h 25 min
Total time: 1 h 55 min
Yield: 4 servings
Cuisine: International
Ingredients: Chicken Marinade; 2 pounds of boneless chicken; 5.3 ounces of plain greek yogurt; 2 cloves of garlic, finely minced; 1 teaspoon of ginger paste; 1/2 teaspoon of salt; 1/2 teaspoon of turmeric; 1/2 teaspoon of garam masala; 1/2 teaspoon of ground coriander; 1 teaspoon of dried fenugreek leaves; Makhani Sauce; 6 cloves of garlic, chopped; 2 small green chilies, stem and seeds removed; 2 small red chilies, stem and seeds removed; 1 large yellow onion, quartered; 2 inches of fresh ginger, peeled; 8 tablespoons of butter, divided; 3 tablespoons of tomato paste; 2 tablespoons of garam masala; 1 tablespoon of ground coriander; 1 tablespoon of ground cumin; 1 tablespoon of turmeric; 1 teaspoon of kashmiri chili powder; 1 cup of chicken stock (or water); 29 ounces of tomato puree; 1 tablespoon of dried fenugreek leaves; 1 1/2 cups of heavy cream; Fresh cilantro, finely chopped (optional garnish); Additional heavy cream (optional garnish); Black sesame seeds (optional garnish)