FAIL - German slow-cooked pork shoulder with red cabbage

I did not like this very much. My diners were very polite about it, but I think they didn't much enjoy it, either. The cabbage was very vinegary and the pork rather bland.

http://www.geniuskitchen.com/recipe/german-crock-pot-pork-with-cabbage-423823
4 cups shredded red cabbage
1 onion, chopped
1⁄2 cup brown sugar
1⁄2 cup apple cider vinegar
1⁄2 teaspoon salt
1⁄4 teaspoon pepper
3 lbs boneless pork shoulder

Combine cabbage, onion, brown sugar, and vinegar in 4 to 4 quart slow cooker. Sprinkle roast with salt and pepper and brown in heavy skillet, about 5-6 minutes total, turning until browned on all sides. Place pork in slow cooker; cover, and cook on Low for 7-8 hours until pork registers 160 degrees F.