In a 6-quart electric slow cooker, combine the water, vinegar, sugar, pepper & onions, mixing well
Place the corned beef in the mixture (if corned beef came with spice packet, sprinkle over top)
Scatter potatoes over the top and along the sides
Cover and cook on high heat setting for 4 hours
Remove the lid and scatter the cabbage wedges over the top
Cover & continue cooking on high for 3 or 4 hours longer, or until the beef is tender
To serve, carve the beef into slices, and serve with the cabbage and potatoes, with some of the cooking liquid spooned on top of the beef to keep it moist
Recipe submitted by ~Donna~ V on 11/30/97