Place 4 tablespoons bacon grease in pressure cooker, then chop fine 1 small onion in grease and brown onion to golden brown. Shred 1 (2 1/2 pound) head of red cabbage. Mix 1/4 cup vinegar and 1/4 cup water and 2 tablespoons sugar. Then place cabbage in onion and grease. Pour mixture of vinegar and sugar on cabbage. Season with salt and pepper to taste and mix lightly. Quarter 1 large pared apple and place on top of cabbage. Cook 4 minutes. When using an ordinary pot the cooking time is 20 minutes. This makes 10 servings.