I like them all by themselves with a little salt after cooking them for stock with onion, garlic, celery, a little carrot, fresh grated ginger root and some salt free lemon pepper. Helluva stock ingredient!
I've never tried them but I'll bet a pressure cooker would melt 'em. ;-) I do calves feet and barbacoa for 1 hour. Chicken feet, 40 minutes as if I go over that, the bones disintegrate.