Since we were planning a quiet little Christmas dinner, we wanted to do something special yet simple. I've had gratin on my mind for the last few weeks so I took a peek in Mastering the Art of French Cooking for ideas. I found two. One was the master gratin recipe and the second was a recipe for ham and leek gratin. Sections of leek are parboiled in salt water and boil, wrapped in ham, then covered in sauce then baked until beautiful. We didn't have any ham, but we had freshly made bacon. So we went ahead with the idea that we would make the bacon leek gratin and put it on top of potatoes.