Wild passionfruit (Passiflora foetida). It's my understanding that these are not edible, as are the cultivated ones. It's kinda cool how they fold up a little "basket" over the developing fruit.

09/07/2020 Addendum: These are indeed edible. In fact, after learning that, I have eaten a few. They are not as tasty as the cultivated varieties, but they definitely do have the unmistakable tang of passion fruit.

aaapassionflower