I scrubbed them good and put a coat of mineral oil on them just like you use on a wooden cutting board. I'll have to share what I learned recently about mineral oil next time.
Well I can't take the credit for their deliciousness. I found the recipe at Dancing Branflakes. She's got great pictures. She did warn about the cheese oozing out, so I was sure to seal mine up tight. Which I probably could have done a little prettier. But hey they were so yummy it didn't matter. I did need to cook mine a little longer and I also made a batch with nuts and some without. They were both good. I hope you'll head on over to Dancing Branflakes and get the recipe, I highly recommend it. And next time you're looking for something to serve your food on, see if you can find some slate.