Chicken Meatball Tikka Masala

Name: Chicken Meatball Tikka Masala
Ingredients: For the meatballs; 1 pound ground chicken thigh meat; 2 shallots, minced; 1/2 cup cilantro, minced; 3/4 cup fresh white breadcrumbs; 1 egg; 1 tablespoon tomato paste; 1 tablespoon ginger, minced; 1 teaspoon salt; For the masala sauce; 1 1/2 tablespoons vegetable or other neutral oil; 1 teaspoon mustard seeds; 4 shallots, minced; 4 cloves garlic, minced; 2 tablespoons ginger, minced; 1 teaspoon cumin; 1 1/2 teaspoons coriander; 1/4 teaspoon cayenne pepper; 1/2 cup canned tomatoes; 1 1/2 tablespoons tomato paste; 1 teaspoon sugar; 1 serrano chile, halved lengthwise; 1/4 cup coconut milk; 1/4 cup cilantro