- 1 teaspoon vegetable oil
- 1/2 cup minced onion
- 1/3 cup red wine
- 1 cup black currant jelly
- 2 oranges, zested and juiced
- 1 lemon, zested and juiced
- 1 tablespoon brown sugar
- 2 teaspoons freshly ground black pepper, or to taste
- 1/4 teaspoon mustard powder
- 1/4 teaspoon ground ginger
- 1 pinch cayenne pepper
- salt to taste
- Heat vegetable oil in large saucepan over medium heat. Cook and stir onions in the hot oil, until nearly dark brown, 10 to 15 minutes.
- Pour wine into the saucepan, bring to a simmer and cook until reduced by half, about 1 minute; remove pan from heat.
- Stir currant jelly, orange juice, orange zest, lemon zest, lemon juice, brown sugar, black pepper, mustard powder, ginger, cayenne pepper, and salt into onion mixture until combined.
- Bring sauce to a boil; remove from heat.