1/4 cup extra-virgin olive oil
3 pounds onions, chopped
1 cup cider vinegar, or wine vinegar (I used apple cider vinegar…5% acidity)
3/4 cup sugar
1 large sprig fresh rosemary
1/2 to 1 tablespoon soy sauce (to taste)
Freshly ground black pepper (a few turns on the grinder…to taste)

Heat the olive oil in a large saucepan over medium-high heat. Add the onions. Decrease the heat to low and stir to coat the onions with the oil. Cook, stirring occasionally, until the onions are translucent and soft, about 30 minutes.

Stir in the cider vinegar, sugar, rosemary, soy sauce, and pepper. Simmer for another 5 minutes.

Pack the onion mixture into clean, hot half-pint jars, leaving 1/2-inch headspace. Remove any air bubbles and seal.

Process in a boiling water bath for 10 minutes.

Let the jars stand undisturbed for 12 hours. Do not open for at least 6 weeks to allow the flavors to develop.

Yield:  Approximately 4 half-pints