Ugli Fruit - A Jamaican fruit with loose, yellow-green skin. The fruit is thought to be a cross between the tangerine and the grapefruit with a grapefruit-orange flavor.

Unmold - To remove molded food from its container.

Unsalted Butter - Butter which contains no salt. Unsalted butter is more perishable than butter with salt.

Upside-Down Cake - An upside-down cake is generally made by first covering the bottom of the baking pan with butter, sugar, and arranged fruit. A cake batter is then poured over the fruit. The baked cake is inverted onto a serving plate, which makes the fruit bottom the top of the cake. Recipe: German Chocolate Upside Down Cake