Tomato and Apple Mincemeat

One peck green tomatoes, 1 peck apples, 3 pounds brown sugar, 1 tablespoonful flour, 1 cup vinegar, butter size of an egg, 1 teaspoonful cinnamon, 1 teaspoonful allspice, 1/2 teaspoonful black pepper, nutmeg and salt to taste, 1 cup currants. Boil down like any mincemeat. Lemons may be added.