How to Cook Chicken Curry

3 pounds chicken pieces or 1 ½ boneless skinless chicken 2 tablespoons vegetable oil 4 cardamom pods (optional) 1 2-inch piece of cinnamon stick (optional) 1 medium onion, finely chopped 4 garlic cloves, chopped 2 teaspoons fresh ginger, chopped 1 medium tomato, finely chopped 1 teaspoon cumin powder 1/2 teaspoon turmeric 1...