I never cooked with it, although I know it was possible. I loved eating it... or scooping out the seeds and adding just a bit of water to make a drink. To this day, there's a taqueria here in town that serves passion fruit juice and I order it every time I go. It's especially nice to drink it at night right before bed because it has a mild sedative effect.
But, just because *I* don't cook with, doesn't mean I can't share a recipe (the Internet is a wonderful thing). Here are a couple of recipes of food/drink I tried in Brazil (and if I can ever find passion fruit in the stores, I'll be sure to try my own hand at them):
No cook passion fruit mousse
Passion Fruit Caipirinha
If you have passion fruit where you live, give these a try (and let me know.. I might come visit!)