Even though it is hard to imagine a more versatile vegetable than the onion, they are rarely served as a side dish. There are several varieties, of course, from the standard large yellow onion and the fresher white onion to the sweeter red onion and the very sweet Vidalia. They also come in various sizes, from gigantic to walnut-sized boiling onions to miniature pearl onions. Large onions end up in all manner of soups and sauces, but can also be halved and baked and served as a vegetable. Smaller onions can be glazed or roasted.