Created by Engrossed on November 12, 2011
Step 1: Preheat oven to 350 degrees Fahrenheit. Grease a 13x9 baking pan.
Step 2: Cream together butter and sugar, add egg yolks gradually.
Step 3: Sift the flour, baking powder and salt into the batter. Stir.
Step 4: Add milk, vanilla, lemon juice and lemon rind. Stir.
Step 5: Beat egg whites until stiff. Fold into batter.
Step 6: Pour into 13x9 baking pan. Top with crumb topping and bake for 30-40 minutes or until tester comes out clean.
Step 7: Crumb topping: Mix dry ingredients together. Cut in the butter with a pastry blender or the back of a fork until it resembles crumbs. Scatter crumbs over unbaked cake.