Chicken in Creamy Tomato Curry: Chicken Tikka Masala

INGREDIENTS

• 1/2 cup cloves garlic, whole
• 2 tablespoons tomato paste
• 1 teaspoon garam masala
• 2 serrano peppers, minced (seeds removed if you don't want it spicy)
• 1 cup plain yogurt, whisked until smooth
• 3 tablespoons Ginger-Garlic Paste, recipe follows (or 1 tablespoon grated fresh ginger and 3 cloves garlic put through a garlic press or finely minced)
• 1/2 cup fresh ginger, peeled, cut into 1/2-inch slices
• 1/4 cup canola oil
• 1/3 cup Ginger-Garlic Paste, recipe follows (or 6 cloves garlic and 2-inch thumb ginger minced)
• 1/2 teaspoon freshly ground black pepper
• 2 teaspoons paprika
• 1 teaspoon kosher salt
• 1 pound boneless, skinless chicken thighs, poked with a fork, and cut into large bite-sized chunks
• Oil, for grilling
• 1 tablespoon dried fenugreek leaves (optional)
• 1 to 2 cups water
• Cooked rice, naan, or crusty piece of bread, for serving
• 3 tablespoons butter
• 2 teaspoons olive oil
• 8 Roma tomatoes, diced
• 1 1/2 teaspoons kosher salt
• Minced fresh cilantro, for garnish
• 1/2 cup heavy cream