Light and Luscious Lemon Pave

4 eggs, separated

3/4 c sugar

1/2 T oil

1 t vanilla

3/4 c cake flour

1 t baking powder

1/2 t salt

Lemon Filling:

5 egg yolks

1/3 c sugar

1/2 c lemon juice

4 T butter

1 t fresh grated lemon peel

1/2 c heavy cream

Lemon Buttercream Frosting:

1 1/4 c butter, softened

2 t grated lemon peel

3 T lemon juice

3 c powdered sugar

Place egg whites in mixer bowl. Attach bowl and wire whip to mixer. Turn to speed 8 and whip until stiff but not dry. Remove from bowl and set aside.

Place egg yolks and sugar in mixer bowl. Attach bowl and wire whip to mixer. Turn to speed 6 and whip until thick and lemon colored, about 1 minute. Stop and scrape the bowl. Add oil and vanilla. Turn to speed 4 and whip for 30 seconds. Gently fold egg whites into egg yolk mixture.

Sift flour, baking powder, and salt together. Fold half of flour mixture into egg mixture. Repeat with remaining flour mixture.

Pour batter into a 10x15x1-inch jelly roll pan which has been lined with wax paper, greased and floured. Bake at 375 for 10-12 minutes. Immediately loosen cake from pan and invert onto a towel sprinkled with powdered sugar; cool completely.

Cut cake crosswise to form 3 5x10x1-inch layers. Spread lemon filling between layers. Cover cake tightly with plastic wrap and refrigerate at least 4 hours. Frost and decorate with lemon buttercream frosting.

To make lemon filling:

combine egg yolks, sugar, and lemon juice in double boiler over boiling water. Cook, stirring constantly, until mixture is very thick, about 5 minutes; do not boil. Remove from heat. Add butter, one tablespoon at a time, beating thoroughly until incorporated. Stir in lemon peel. Cover mixture and refrigerate 1 hour.

Place cream in mixer bowl. Attach bowl and wire whip to mixer. Turn to speed 10 and whip until stiff. Fold whipped cream into egg mixture. Refrigerate until ready to use.

To make lemon buttercream frosting:

place butter, lemon peel, and lemon juice in mixer bowl. Attach bowl and flat beater to mixer. Turn to speed 6 and beat 30 seconds. Stop and scrape bowl.

Sift powdered sugar into bowl. Turn to speed 2 and beat 30 seconds. Stop and scrape bowl. Sift powdered sugar into bowl. Turn to speed 6 and beat until fluffy, about 2 minutes.