Put everything, except the vanilla, into a medium bowl. Place the bowl over a pot of simmering water to make a double boiler. Do not let the bowl touch the water. Place a spatchula into the pot to allow the steam to escape.
Cook mixture over medium-low heat and beat with a hand mixer on medium high speed. It should take seven minutes to achieve stiff peaks.
Remove from heat and beat in vanilla. Separate into three bowls with food coloring. Whip in the colors being careful not to over whip the frosting. It will turn to liquid and loose all the air bubbles if you over whip.
Frost immediately or cover with plastic wrap pressing onto the frosting to avoid drying out.
Level one cake layer and place on a serving tray. I also trimmed the edges of the cake because they were a bit browner than I desired. Place a brownie on top.
Add some Orange (special sauce), Green (lettuce), and Yellow (cheese) allowing some to drip over the edges.
Level a second cake and repeat with the brownies and frosting.
Top with remaining cake and sprinkle on some sesame seeds.
by Karyn Granrud
This cake can be made all in one day. Simply buy the foil round pans and bake everything in one day. Save the egg whites from the Yellow Cake to make your frosting.