I only used ingredients that I had in my fridge, so adding celery and potatoes would be a great addition. The beef was so tender and melted off the bone. I also toasted some sourdough bread to soak up the rich broth.
I also got a dutch oven as a gift and can't wait to use it and see how it differs from a slow cooker. But until I take it out of its box, here's a list of other slow-cooker recipes I'll be trying very soon!