"[Photographs: Elizabeth Barbone] Grapefruit zest adds a burst of sunny citrus flavor to this dense and surprisingly lower-fat pound cake. Variations: Dairy-free Replace the greek yogurt with silken tofu Citrus-free Omit grapefruit zest and grapefruit glaze. If desired, ice cooled cake with a simple confectioners' sugar glaze. Combine 1 cup confectioners' sugar with three tablespoons of milk or dairy-free milk replacement. About the author: Elizabeth Barbone of GlutenFreeBaking.com joins us every Tuesday with a new gluten-free recipe. Elizabeth is an alumna of the Culinary Institute of America and Mount Mary College. With her solid professional baking background, Elizabeth is known for creating gluten-free recipes that taste just like their wheat counterparts. She is the author of Easy Gluten-Free Baking. Every recipe we publish is tested, tasted, and Serious Eats-approved by our staff. Never miss a recipe again by following @SeriousRecipes on Twitter!..."