Depends what I'm going to be eating, but I like ghee for most frying.  I bring a small amount of olive oil for cous cous and dried hummus (if those are on the menu) and canola oil if I need something else.  The only problem with ghee is the residue, but a decent dish soap and warm water does a great job.  Sometimes I will bring a few paper towels to wipe out ghee infused dishes before cleaning, that seems to help (and boy do those towels burn well...).