Onion sauce is a flavorful condiment made primarily from onions, often cooked down with various seasonings and liquids. It can be prepared in different ways, including sautéing onions until they are caramelized, then adding broth, vinegar, or wine to create a rich sauce. This sauce is commonly used to enhance dishes like meats, vegetables, and pasta. The versatility of onion sauce allows it to be adapted to various cuisines. For instance, it can be found in French cooking as a base for French onion soup or in Italian dishes to complement grilled meats. Its sweet and savory profile makes it a popular choice for many recipes.