Preheat oven to 350 degrees F and stick your pizza stone inside to warm up. Do not stick a cold pizza stone directly into a very hot oven as it could crack! Let heat for 30 minutes, then raise heat to 475F.If you don't have a pizza stone, skip this step!
Remove dough from bowl and place on a well floured surface. Work into a circular shape that's evenly thin in the middle and thicker around the edges.
Carefully remove the pizza stone from the oven and transfer the pizza to the stone. Place back in the oven and bake for 4-5 minutes. Don't skip this step! It ensures that the center part of the pizza crust cooks through and doesn't get soggy.
Remove pizza from the oven (leave the stone in) and spread tomato sauce all over the pizza, leaving about a 1/2 inch border around. Top with mozzarella, then arrange veggies in a circular pattern following ROYGBIV order, with the purple potatoes in the center and cherry tomatoes closest to the crust. Season with sea salt and crushed red pepper.
Bake for 10-12 minutes, until the crust is golden and the cheese has melted.
Remove from oven and slice in half to form two rainbows. Enjoy!