This is basically a cucumber, in fact I know them as horned cucumber too. I was first introduced to them growing wild on a property where my father grew up when I was but a tot but too scared to touch them because they look somewhat like a vegetable hand grenade. Then in my early 20's I grew them again and just couldn't get a taste for them.
I tried them again in my mid 50's and now nearly a decade later look forward to a crop every year so I can eat fresh fruit during the winter.
They need to be super ripe before harvesting and will mature even more after picking. Mine usually have the first couple of frosts on them before I harvest and keep them on a verandah and finally go golden yellow on the skin.
It is a job to hold onto them and cut in half and scoop out the sweet green jelly inside. It is really a dessert vegetable.
I love them.
So once you are clear of frosts get them out side and let them run wild.
To get the best out of them let them ripen properly, by letting the skin go golden yellow.