On lockdown and feeling the urge to bake, but missing something apparently vital? Cake has taken on a new significance now that most of us are stuck at home all day, every day. We’re comfort-eating and baking like there’s no tomorrow. But what do you do when you’re craving cake, but can’t find eggs, and the flour shelves are empty at your local grocery store? Here are some recipes and ideas from great bakers, past and present, to get you through every ingredient shortfall.