Roasted-Tomato Sauce

Preheat oven to 500F.

Arrange the plum tomatoes, onion slices, and jalapeno pepper on a jelly-roll pan coated with cooking spray, and bake vegetables at 500F for 30 minutes.

Remove jalapeno pepper from pan. Bake tomatoes and onion slices an additional 15 minutes or until the vegetables are soft.

Combine the tomatoes, onion slices, jalapeno pepper, lime juice, salt, and chipotle chile in a food processor, and process until tomato mixture is smooth.