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Rainbow Cake

Martha Stewart
  • minutes
  • Serves

INGREDIENTS

1

Orange, Red

5

Egg whites, large

3 cups

All-purpose flour

4 tsp

Baking powder

1

Lemony swiss meringue buttercream frosting

1/2 tsp

Salt

2 1/3 cups

Sugar

2 tsp

Vanilla extract, pure

1

Vegetable shortening

2 sticks

Butter, unsalted

1 1/2 cups

Milk