Hungarian Beef Goulash (Crock-Pot)

2med onions, halved and sliced
1 1/2# boneless feef chuck or round steak, trimmed of fat and cut into 1" cubes
4tsp imported sweet paprika
1/4tsp pepper
3T ketchup
2T water
3/4# small red potatoes,shredded
1(14 1/2oz) can sauerkraut, rinsed and drained
1/2c sour cream
1/2-1tsp caraway seeds
chopped parsley for garnish

*in crock mix all but sauerkraut, sour cream, caraway and parsley
*layer sauerkraut on top of beef mixture
*cover and cook on low 8h, until beef is tender
*mix sauerkarut into rest along with the sour cream and caraway seeds
*serve with parsley garnish