Apple Cider Onion Jam

Apple Cider Onion Jam
Makes about 1 cup

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Ingredients
1 medium yellow onion, thinly sliced
2 tablespoons unsalted butter
1 tablespoon sugar
1/4 teaspoon salt
2 tablespoons white wine
1/3 cup apple cider
1 tablespoon cider vinegar

To make the jam:

Combine the onion, butter, sugar, and salt in a small saucepan with a lid. Saute over medium-low heat, covered, for 20 minutes, stirring occasionally. Uncover, add the wine, cider, and vinegar and continue to cook over medium heat, stirring slightly more frequently, until there is no liquid left and the onions are soft and caramelized, about 25 minutes. Let the jam come to room temperature, then transfer to an airtight container and keep in the fridge for up to 3 weeks.