This recipe is from Shirley McNevich's Mom's Best Recipes Vol 5. Published here with her permission.
Don't forget to check Shirley's blog.
(by Shirley McNevich)
2/3 cup softened butter (NO substitutes)
4 cups Domino's powdered sugar
1 fresh lemon (room temperature)
1 tsp. lemon zest (grated lemon peel)
4 TBSP fresh lemon juice
Squeeze the lemon and save the juice. Use a grater on the lemon peel to get
1 tsp. of lemon zest--set aside. In a mixer add butter and some of the
powdered sugar--beat. Keep adding powdered sugar slowly, beating after
each addition. Add lemon zest and lemon juice--beat until mixed, then beat
on high for 3 minutes until smooth and fluffy. If too runny, add just a little
more powdered sugar and beat again. Taste the frosting--if you want it
stronger, add a little more lemon juice.