Mayonnaise is to a sandwich what peanut butter is to jelly. They just belong together: Imagine a BLT without a creamy doodle on top of that slice of sun-ripened tomato, or a smoked turkey club without a thin mayo mortar on the toast. And what's a tuna salad sandwich without mayonnaise? Chuck the bread, toss in some green beans and anchovies and make a salade nicoise instead.
Indeed, millions agree about the importance of mayo, making it one of the top condiments in the U.S., with sales for 2016 reaching $1.93 billion, according to Mintel, a market research firm.
Yes, homemade mayonnaise is great on a sandwich — if you want to take the time to make it and aren't put off by raw eggs (or have pasteurized eggs on hand). For the rest of us, there's a jar of the prepared stuff waiting in the cupboard or refrigerator.