Mix up your cake batter by following the directions on the box.
Divide batter in half. Add red food coloring to one half.
Spray 2 9x13 inch pans with non stick cooking spray.
Pour one color into each pan. Bake for around 15 minutes or until a toothpick in the center comes out clean.
Cool completely. Cut each cake into 12 circles. A 2" cookie cutter will work fine.
No cookie cutter? No problem!
An empty tomato paste can will work just as well.
Alternate 4 red and white cake circles in a jar.