Play with your food! This recipe is more of a concept than a recipe that needs to be exactly followed - you can make your mashed potatoes and sauce any way you want them. It's best to give the child their own portion of lava to pour, makes it more fun! Too bad the lava can't actually shoot out of the volcano, we're working on that. Variations of this can be found all over the web, so I have no idea where the idea originated. This is perfectly vegan friendly, as it can be made with rice or soy milk and margarine, in fact it was written that way when I found it at Veg Family. Enjoy!