Watermelon Cake! ~ a Raw and Vegan Recipe for Kids! by Lisa Viger · Published August 25, 2012 · Updated March 25, 2018 serves about 6-8 people about $1.40 per serving This is a super easy and super fun cake for any party or birthday or any day! Just cut the watermelon into rounds. We peeled the outside with a knife and then cut the peeled melon into cake layer shaped sections. Then, decorate with strawberries, blueberries, cantaloupe, grapes, and kiwi. We used toothpicks to make the fruit pieces stick to the sides of the cake. This went really well with some mango ice cream, which we made by blending frozen mango and banana chunks in the food processor. This is our recipe video! Happy Birthday, Alexandria!