Here's a good way to use leftover pot roast -- with its juices and any leftover vegetables. Its a very flexible, use-what-you've-got soup so its hard to go wrong. If you don't have homemade beef stock (butchers aren't giving away bones anymore), soup base is tastier than regular bullion. I like the Tones brand you can get at Sam's Club. Note: I couldn't get the recipe editor to accept leftover vegetables as an ingredient, but if you've got some hanging out in the fridge throw them in.