Serve this with our Roasted Boar (or Pork).
Bring all ingredients except salt and pepper to a boil in a large pot. Reduce heat, and simmer until fruit is very soft and sauce reduces, about 4 hours. Let cool slightly. Refrigerate overnight.
Puree half the fruit mixture in a food processor until smooth. Stir puree back into fruit mixture, and season with salt and pepper. (Mostarda can be refrigerated for up to 1 week.)