Sweet Potato-Banana Purée by Nancy Miyasaki

This fruity purée from Chef Ron Siegel of Masa's in San Francisco may be made up to 1 day ahead; cool, cover, and chill. Reheat, covered, in a microwave oven on full power (100%), stirring occasionally for about 3 minutes. I wouldn't have thought banana would be a positive addition to a sweet potato puree, but it really is. The…