Red onions are more often than not used raw, typically sliced and added to salads and sandwiches and the like. Here, however, the onions are cut into quarters and roasted in the oven along with breadcrumbs and a drizzle of olive oil. Similar to other types of onions, they turn wonderfully sweet and the natural sugars are caramelized during cooking, and they make a delicious side dish for roast chicken or pork.