This is what I found inside the kiwano. There are several sites detailing how to eat this fruit and, with some hesitation, I proceeded. The taste was surprisingly mild and vaguely citrus like. The seeds are flavorless. It will not become my fruit of choice but I’m glad I tried it.
“Cucumis metuliferus, horned melon or kiwano, also called African horned cucumber or melon, jelly melon, hedged gourd, or melano, is an annual vine in the cucumber and melon family. It is considered to be the ancestor of the other cultivated melons. Often known by its nickname in the southeastern United States, blowfish fruit, it is grown for its fruit, which look like oval melons with horn-like spines. The fruit of this plant is edible, but it is used as often for decoration as for food. When ripe, it has a yellow-orange skin and a lime green, jelly-like flesh with a tart taste, and texture similar to a cucumber. The horned melon is native to Africa, and it is now grown in California, Chile, Australia and New Zealand, as well.”
I plan to sample the fruit later today.