What can I do with unripe pears?

I bought a crate of organic pears from a farmer about a month ago. They came green and rock-hard, and most of them have never advanced beyond this state. I've tried putting them with some apples to see if that would ripen them, but no luck. They're edible, but crunchy and tasteless. A few have gone directly to mold - I had to throw three away yesterday. I guess they're just never going to ripen. So -- any ideas of what I could do with these pears? I'm open to cooking them in some way, just not sure if the final product will be all that interesting since the pears themselves lack flavour.

Thanks in advance.