Uses for fondue broth? I had meat fondue last night: beef, chicken, and shrimp cooked in a simple vegetable broth at the table. When we were finished eating, the broth was thrown away. I could only help but wonder: are there any typical dishes made with the used broth?
I would use this broth to make soups. It would make a great base for a number of soups such as scotch broth, but also for using for the stock for making other soups such as lentil or whatever you fancy.

Good luck!