Slow Cooker Roast Beef

OMG! Is the only way I could describe this. I can't remember what magazine I snagged this out of but it was probably taste of home or family circle. But it is by far the best roast beef I have ever tasted. I served this with yeast dinner rolls, home fries, and steamed peas. DEFINITELY fixing this again.

Slow Cooker Roast Beef

1 boneless beef chuck roast (4lbs) trimmed

1 large sweet onion, chopped

1 1/3c. plus 3 tbsp. water, divided

1 (10.5oz) can condensed French Onion Soup

1 c. packed brown sugar

1/3c. reduced sodium soy sauce

1/4c. cider vinegar

6 cloves of garlic, minced

1/4 tsp pepper

1 tsp. ground ginger

3 tbsp. cornstarch

Cut roast in 1/2. Place in slow cooker; add the onion and 1 1/3c. of water. Combine all but cornstarch and remaining water in a bowl and pour over top of roast. Cook on low for 7-9 hours. Remove roast from cooker, strain juices and transfer to a small saucepan. Bring to a boil. Combine cornstarch and water until smooth and gradually add this to the boiling juices, stir until thickened.