You are here: Home » Recipes » Key Lime Butter Key Lime Butter Recipe by Favorite Recipes Press Yield 1 1/2 cups Try this simple recipe for a zesty key lime butter. PrintEmail Ingredients 1 cup unsalted butter, softened3 tablespoons confectioners' sugar3 tablespoons Key lime juice3 tablespoons sweetened condensed milk1/2 teaspoon grated lime zest Instructions Beat the butter in a mixing bowl until smooth. Add the confectioners' sugar, lime juice and condensed milk and mix well. Stir in the zest. Spoon into a container. Chill, covered, until firm. Recipe reprinted with permission from AT&T Pioneers’ Calling All Cooks four (AT&T Pioneers Alabama Chapter, Birmingham, Al., 2000).