Heat a pot or saucepan over a medium heat and cook the onion in some cooking fat until soft, about 6 minutes.
4 tablespoon chopped onion, Cooking fat
Stir in the orange juice, apple cider vinegar, tomato paste, garlic, mustard powder and paprika. Season to taste with sea salt and freshly ground black pepper.
1 cup freshly pressed orange juice, 2 tablespoon apple cider vinegar, 10 tablespoon tomato paste, 4 cloves garlic, ½ teaspoon mustard powder, ½ teaspoon paprika, Sea salt and freshly ground black pepper to taste
Bring to a simmer and then let simmer, uncovered, for about 20 minutes.
Use immediately to cook chicken or reserve in the refrigerator.