4 lb. beef pot roast, cut into 3 pieces6 garlic cloves1/2 cup coarsely chopped onion1/2 cup chopped parsley8 cups cold water1 teaspoon pepper1 tablespoon salt1 teaspoon allspice1/2 teaspoon cumin seeds2 bay leaves1 tablespoon wine vinegar1 head green cabbage, cored and quartered1 loaf Portuguese bread, cut into 1 inch slices15 whole fresh mint leaves