The traditional recipe for 7UP pound cake combines lemon-lime soda with butter, eggs, flour and sugar. Vanilla extract, lemon zest and lemon extract are added for flavor before baking at 350 degrees Fahrenheit for 65 minutes.
7UP pound cake, also called lemon-lime pound cake, was invented in the 1950s when the 7UP company suggested replacing other liquids in pound cake recipes with its soda. To make this recipe, combine 1 1/2 cups softened butter, 3 cups sugar and 5 large eggs in a stand mixer. Stir in 2 tablespoons of lemon zest and 1 teaspoon each of vanilla extract and lemon extract.
With the stand mixer running, slowly add 3 cups all-purpose flour and 1 cup lemon-lime soda. Pour into a greased Bundt pan and smooth the top with a rubber spatula. Bake at 350 degrees Fahrenheit for 50 minutes, then cover with tin foil to avoid excessive browning, and bake for an additional 15 minutes or until a toothpick inserted in the center comes out clean.
Cool the cake on a wire rack for 10 minutes, then place a serving platter on top of the Bundt pan and flip the cake over to remove from the pan. Top with icing, lemon-lime glaze, or candied lemons, and garnish with lime rind twists.