1 cup butter, room temperature
1/3 cup vegetable shortening
1 teaspoon vanilla extract
2 pounds powdered sugar, sifted if from a box
3 tablespoons fresh lemon juice
3 tablespoons heavy cream
Lemon yellow gel or paste food coloring, if desired.
In a large bowl of a stand mixer, cream the butter and shortening together until well blended. Add the vanilla and mix well. Add half of the powdered sugar and mix on low until well blended; scrape down the sides of the bowl. Add the lemon juice and mix on low until well blended; scrape down the sides of the bowl. Repeat with the remaining powdered sugar and the heavy cream. Add a little yellow food coloring to tint the frosting, if you want. Mix a final time on medium-low to medium until the frosting is smooth and creamy, about 1 minute.
Makes about 5 cups frosting.