just came back from cameron highlands....bought some tamarillos (folks in cameron call them passionfruit, though) but they don't really taste great on its own, as they're quite sour. My sister made them into sorbet (she saw jamie oliver making them in one of his shows)...it's a really simple recipe too...
1 cup water
3/4 cup sugar
15 passion fruits
Place the water and sugar in a pan, bring to the boil and simmer for 5 minutes. Remove from the heat and allow to cool for a while.
Halve the passion fruits and scoop out the flesh, seeds and juice using a spoon. Stir this up--you can pass it through a sieve to remove the seeds.
Mix the passion fruit with the sugar syrup and some of the seeds in a plastic tub or earthenware dish and place in the freezer.
Generally, sorbet takes 2 hours to set. Try to stir it around every 1/2 hour if you remember (this helps to incorporate air into the sorbet and make it light)