This simple balsamic onion relish recipe for canning uses sweet Vidalia onions for a toothsome, old-fashioned yet versatile relish perfect for hot dogs and grilled meats. It is also a favorite topping for charcuterie board finger foods.
Sice or chop onions, whatever size you prefer, I like to rough chop mine to give it more of a relish consistency.
Cook onions over medium heat with a little bit of oil until soft and golden brown. Stir in garlic and cook for 1 to 2 minutes.
Stir in sugar and balsamic vinegar.
Reduce heat to medium-low and cook for 45 minutes to an hour, stirring frequently, until the balsamic mixture is cooked down and thickened.
Strain onions, remove most of the balsamic mixture, and transfer to a glass jar with a lid.
Notes
Your sweet balsamic onion relish will keep in the refrigerator for 7 to 10 days. You can also freeze it for several months. If you want to can it for pantry storage, use clean hot jars, keep the vinegar amount as written, process it in a boiling water bath, and adjust the processing time for your altitude.