Instant Pot Butter Chicken

Name: Instant Pot Butter Chicken
Ingredients: 1 stick (8 tablespoons) cultured or unsalted butter; 2 tablespoons finely grated fresh ginger; 4 teaspoons fenugreek leaves; 4 teaspoons fenugreek seeds; 4 teaspoons garam masala; 6 cloves garlic, chopped; 5 green cardamom pods; 1 large onion, sliced; 1 serrano chile, stemmed and split lengthwise; One 3-inch cinnamon stick; Kosher salt; 1/4 cup tomato paste; One 28-ounce can peeled whole tomatoes; 2 pounds boneless, skinless chicken thighs; 1/2 cup heavy cream; Chopped fresh cilantro, steamed basmati rice and naan, for serving