For the low carbers out there, I used to make jicama nachos. Just slice them and pile cheese and sliced pickled jalapeños on top. Easy. Balance the cheese on the veggies or it will slide right off, but also good.
Another great twist. I love jicama and will eat it just with a little lime juice. As far as fire cooking, I remember a party we had where we wrapped bananas in foil, they were split and had nuts and peanut butter in them, and some honey. I had one with no peanut butter. Peanut butter is in my blue cheese and olive icky basket.