What Is This Berry?

Question

I thought just looking at the leaves , it was a passion fruit vine. then these tiny green fruit appeared and it turned dark purple/black. I was brave enough to taste it and it was anything but a passion fruit.. It had 1 large seed and it had no flavour

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Answer 1

That is, definitely, Passiflora suberosa. The Cork Passionflower.

It just may not be the kind that you are familiar with.

They will have similar care to other Passiflora:

https://www.gardeningknowhow.com/ornamental/vines/passion-flower/passion-flower-care.htm