I stupidly bought a big ol' avocado - not Hass, the other kind - which felt sort of ripe, but isn't. I cut it into quarters and diced up part of it, in case it was edible in its current state (nope). So I don't think it can be returned to the windowsill. It's been in the fridge for a few days now. It's like a rock. A big, green rock. Can I grate it and fry it maybe? Avo-latkes?