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Eventually that cactus/succulent might make some edible fruit. You're just playing the long game...

That very much looks like someone scraped the seeds out of a dragon fruit. DF seedlings grow in a tangle just like this. Pick one or two, grow it up a stake and within five years...food!

Honesty compels me to add that not all DFs are self-fertile, so you might have to plant a related variety nearby and hope it flowers on the same night.