We've all faced ingredient conundrums and last-minute shortages in the kitchen. Oh no! Out of eggs! No crème fraîche! Need a buttermilk substitute! Thankfully, there are a few tried-and-true substitutions you can turn to in a pinch. These can also be helpful if you're trying to modify a recipe out of dietary necessity (shifting it to be dairy or gluten-free, for example). This guide will help get you started.