What’s something that’s rough on the outside, but sweet (or softer) on the inside?
That’s not a joke that needs a punchline or something. It’s because I have a friend who’s like that, and I’m trying to think of something to compare him to.
pineapple
Pineapple?
ETA: simul-post!
Kiwi fruit
Crab! Otherwise known as MrTao 
ETA: Call him soft on the inside to his face - guys like that. 
Okay. I also wonder how he’d react if I called him a pineapple (without any explanation.)
Coconut?
A sweet, sweet geode.
Cantaloupes.
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me.
Pearson’s Nut Roll.
What** ducati **said. Also, gumdrops.
Porcupine
Ferrero Rocher chocolates.
Old-fashioned doughnuts.
perhaps more like an oyster?
There’s a whole country full of people like the OP : Israel.
The traditional nickname for an Israeli is “sabra”, which is a type of cactus that grows all over the country. And produces a sweet edible fruit. So it’s prickly on the outside, sweet inside.
(And it is actually is a pretty accurate and appropriate description of Israeli culture.)
I was thinking of a kitten in a chain mail, uh, kitten suit.
Or Michael Dukakis riding in a tank.
Skull.