Roasting tomatoes is great way to concentrate their flavor. Slicing them before roasting makes it a snap to blend them into your favorite pasta sauce, or to simply toss them on a piece of toast for an explosion of summer flavor. We recommend using a tomato with a higher water content, such as heirloom or beefsteak (or most round tomatoes). A tomato with a lower water content, such as Roma or plum, has a tendency to burn before it caramelizes.