Cooking in clay is one of those things that you read about in cookbooks and wonder what the fuss is all about — or at least I did, until my mother gave me this funny little pot one year for Christmas. I have no idea where she found it, it was an odd gift, even for her. For the first few years I had it, I assumed you could only use it in the oven. It wasn’t until I was at a party during one of the Squaw Valley Writers workshops and saw Barbara Hall using hers on her stove…