Red Pepper Onion Relish is a tangy and flavorful condiment made with red bell peppers, onions, vinegar, and spices. It adds a burst of flavor to sandwiches, burgers, and grilled meats. The sweetness of the red peppers and the slight tanginess of the onions create a perfect balance. This relish can be made ahead of time and stored in the refrigerator for up to a week.