Balsamic Glazed Pork

1 (2 pound) boneless pork tenderloin
1 tsp ground sage
1/2 tsp salt
1/4 tsp pepper
1 clove garlic, crushed
1/2 C water

Glaze:
1/2 C brown sugar
1 T cornstarch
1/4 C balsamic vinegar
1/2 C water
2 T soy sauce

Combine sage, salt, pepper and garlic.  Rub over roast.  Place in slow cooker with 1/2  C water.  Cook on low for 6-8 hours.  About 1 hour before roast is done, combine ingredients for glaze in small saucepan.  Heat and stir until mixture thickens.  Brush roast with glaze 2 or 3 times during the last hour of cooking.  Serve with remaining sauce on the side.