[sophistacavy]

I've heard (and will be trying soon with a red bell pepper) that if you keep on offering the veggie to the cavy, every day, consistently, that eventually (some cavies can take several weeks of wasted veggies I heard) their curiosity will overpower them, and they will eat it. This also might not work with every single cavy, so don't take my word for it, but I'd definitely still try it.

Hope this helps you and your guinea pigs!

P.S.: I've also read that cavies don't like their veggies cold, and prefer to eat them once they've reached room temperature. Try letting the veggie sit out at room temperature for a bit, check on it to see if its there yet. I would find an airtight container to let it reach room temp. in, so its not just sitting out in open air, going bad. =) Good luck!