What on earth do I do with these yams??

[SilverSixpence]

I bought some yams thinking they were sweet potatoes, to make for DS's dinner. The yams don't look very appealing, should I still make them for him? I've heard they are a bit poisonous if not cooked properly (!) but could be making that up

or any ideas for how to cook them for us?

SilverSixpence - I did the same thing a few years ago, ie thinking they were sweet potatoes. I cooked them and tried to eat them - they were completely horrible in taste and texture, a bit like cooked dishcloths. (Or how I imagine cooked dishcloths to taste- I haven't actually eaten them ).
My advice - transfer to the compost bin in their raw state and put it down to experience.