I am in Southern Africa and this grew wild in my garden. I believe it to be wild cucumber/ Coccinia mackenii, or bospampoentjie in afrikaans. It’s supposed to be edible, this one was apparently not quite ripe as they are supposed to turn orange, but it was very bitter. I’d never seen a cucumber with bright red flesh like that, for a moment I thought I had cut into my own finger when I saw the red on my knife.

Thought some garden nerds here might appreciate my find :) there are so many cool plants here