French Dip

I just made this for dinner tonight. The recipe is from Liz Andrews, she made it for Ambyr when Am had Grace and I have been dreaming of it ever since. It's so easy, but who doesn't love a crock pot recipe?!
French Dip

1 large onion, sliced
3 lb. beef roast
½ c. water
1 pkg. au jus gravy mix (you can find this in the gravy isle at the market)
2 cans beef broth

1. place onion in cooker. Add roast
2. combine water and gravy mix, pour over roast
3. add broth
4. cook on low 10-12 hours
5. remove meat from liquid, let rest for 10 minutes, shred or slice