Prepare cake batter following box instructions EXCEPT replace the water with milk but only half the amount.

Example: If the box calls for 1/2 cup of water; add 1/4 cup of milk instead

Add juice of 1/2 lemon and 1 teaspoon lemon zest.

OPTIONAL: a few drops yellow food coloring

Spoon batter onto parchment lined baking sheet by increments of 2 tablespoons

Bake 6-8 minutes at 350

Meanwhile, beat butter, sugar, marshmallow cream and 1 teaspoon lemon juice.

Beat until fluffy, adding 1-2 teaspoons milk if needed to thin frosting.

Spread filling on the flat side of one cake, and top with another cake.