thats one of the most awesome aspects of them, they are self-packaged. Most of the benefits of plastic, with none of the downsides. The only additional downside it might have that plastic doesn't is it decays and smells bad if youdon't throw it away (but thats ok because its ok to throw it away!)
wait, does that mean we should package other things in fruit and vegitable skins? I guess a hamburger in a coconut shell would work just fine. Squeezing ketchup out of a lemon will probably take a bit more getting used to but ice cream wrapped in a melon skin sounds just fine.
Fruit shall be more popular than ever after we replace the content with meat.
Well, thats the future magic world of building things with proteins.
So, no you wouldn't put ketchup in a lemon, but you might have what appears to be a typical ketchup packet,appears to be made of plastic, but is actually some mix of properties of different organic skins.