Calf’s Liver with Shallot and Wine Pan Sauce

I can’t resist a piece of calf’s liver when I see it—all too infrequently—in the meat counter. It’s even better if you get it from a considerate butcher who will cut an even-sized 1/4-inch slice and spare you the finicky job of removing the outside membrane. Liver in a winey sauce is particularly good on a cold winter night; somehow I always feel my red corpuscles are strengthened by its rich meatiness. I like it with some potatoes alongside. If you have a couple of cooked potatoes, you can brown them in a little butter while the liver cooks, or if you don’t have them on hand, try grating a medium raw potato through the coarse holes of a grinder and make a quick potato pancake.