Bake a white cake according to directions on package. Use 2 8" pans.
layer lemon filling and top with seven minute frosting
Combine 3/4 c sugar, 2 Tbsp. cornstarch and a dash salt, stir in 3/4 c cold water.
Add 2 beaten egg yolks
1 tsp grated lemon peel
3 Tbs. lemon juice
cook and stir until bubbly, continue 1 more minute after bubbling
Stir in 1 Tbs butter
cover surface with wax paper to avoid getting a skin, and cool
spread between layers of cake
Seven minute frosting
1 1/2 c sugar
1/3 c cold water
2 egg whites
2 tsp light corn syrup OR 1/4 tsp cream of tartar
1 tsp vanilla
in the top of a double boiler combine sugar, water, syrup OR tartar and salt. beat 30 seconds on low. On top of double boiler (top pan should not touch water below) cook 7 min beating constantly. if you have a whip attachment on your mixer this works great but is not needed.
when stiff peaks form remove from heat and add vanilla, beat 2-3 more minutes until spreading consistency. Frost tops and sides of cake generously.this is a classic old fashioned frosting that is definitely worth the work!