- 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.