In a large saucepan, heat olive oil over medium heat; add onion. Saute over heat until translucent and beginning to brown, about 6 minutes. Add apples; sauté 4 minutes more. Add vinegar, raisins, ginger, mustard, and cayenne. Stir well to combine; cover. Continue cooking, stirring occasionally, until apples are very tender but hold their shape, about 3 minutes. Season with salt and pepper. Cool and store in the refrigerator. It should keep for about a month.
Ingredients:
2 tablespoons olive oil 1/2 cup chopped onions 4 apples, peeled, cored, and cut into 1/2-inch dice 1/2 cup apple cider vinegar 1/2 cup golden raisins 1 teaspoon ground ginger 1/4 teaspoon dry mustard Pinch of cayenne pepper