Iconic recipes have to come from somewhere. Welcome to First Draft Foods, where this week we delve into the legends and controversies behind the world’s favorite dishes. With its deep crimson layers topped with thick tufts of snowy frosting, red velvet cake cuts a striking figure. This unmistakable cake ranks high in the pantheon of iconic American desserts. “If you show up with a red velvet cake, people will love you,” says Vallery Lomas, the winner of The Great American Baking Show and the author of Life Is What You…