I don't particularly care for roast beef, but my family loves it;so, sometimes I have to make it. Now, what I do like is roast beef sandwiches. But, the kicker is that I have to have beef gravy on mine. So, here's my recipe for getting a really rich beef gravy out of your beef broth. You can use canned broth if your roast doesn't make enough.
salt and pepper to taste
1Melt butter in your sauce pan, then add the flour. Whisk the flour for about 1 minute until the flour is "cooked".
2Slowly add the beef broth and stir often for about 8-10 minutes. *Stirring is the key to lump less gravy.