Onion jam is a sweet and savory condiment made primarily from onions, sugar, and vinegar. The onions are typically caramelized to enhance their natural sweetness, and the mixture is simmered until it reaches a jam-like consistency. This process allows the flavors to meld together, creating a rich and complex taste. Onion jam can be used in various ways, such as a topping for cheese platters, a spread on sandwiches, or a flavorful addition to meat dishes. It pairs well with a variety of foods, making it a versatile ingredient in both casual and gourmet cooking.