Buy the fruit you can't name. Eat it.

Somewhere on the nearest market stall or grocer's display there's a fruit you've walked past your whole life because it has no name in your head. Find it. Ask the seller what it's called and how you're actually meant to eat it — peeled, salted, spooned out — then buy one and do exactly that. Worst case it's terrible, and that's still a better story than the banana.