This recipe is from Shirley McNevich's Mom's Best Recipes Vol 1. Published here with her permission.
Don't forget to check Shirley's blog.
(by Jean [Thomas] Taylor - cousin)
3 sticks Parkay margarine
1 1/2 cups white sugar
2 tsp. vanilla
1 tsp. lemon juice
1/2 tsp. salt
1 cup 7Up soda, room temperature
3 cups flour
In a mixer, combine Parkay, sugar and eggs. Add salt, vanilla, lemon juice, 7Up. Beat until smooth. Slowly add the flour and beat until smooth. Pour batter in a greased 9 x 13 x 2 cake pan. Bake at 325 degrees for 75 minutes. Test for doneness with a toothpick. After cooling, sprinkle with powdered sugar.