Yup. I said kippers.
I had never had them before today. I bought a tin a couple weeks back, for reasons that completely escape me. Perhaps there were no reasons. I was completely prepared to hate this dish. MIL said she wasn't even going to try it.
I followed the recipe from Epicurious (Gourmet, January 1995) almost exactly, except I used half the called-for amount of capers, and less onion.
Basically, you slice a russet potato very thin, lay half of the slices in a dish, sprinkle with capers and chopped onion, scatter your bits o' kipper, then layer on the rest of the potato. Salt and pepper, then a cup of heavy cream, and bake at 450 for 30 minutes. The original recipe said 20 minutes, but my potatoes weren't done, and there wasn't that happy crustiness until 30 minutes.
This dish was so good. I'm now thoroughly convinced that anything with potatoes and cream in it is delicious, even if the other ingredients are potentially nasty. It was rich and creamy (duh), with a smokiness from the fish, and only a very slight tang from the capers (I was expecting much more tang, and I'm glad my expectations were not met).
I'm thinking that this would make a good brunch dish, with a salad dressed with something vinegary, to cut the creaminess. But we ate it right out of the dish, standing at the kitchen counter.