So this is the same recipe as Orange Cream Cake except the frosting is a lemon buttercreaem, that's the only difference. Need that recipe? Here you go:
Lemon Buttercream Frosting
1 cup margarine or butter, softened & whipped
2 1/2 cups icing sugar (may need more)
2 tbsp. cream
2 tsp. lemon juice (more or less depending on preference)
1. Add lemon juice and cream to butter, cream together.
2. Gradually add icing sugar until you've reached desired consistency.
3. Spread on cake of choice and enjoy :)
I added two photos simply because I'm proud of my piping skills and how they've been improving =D)