Caper-Stuffed Herring with Warm Potato Salad

I have no time for people who purport to listen to the health pundits and then eat cod-liver oil capsules as their answer to oily fish. I love herrings – the food history of our coastal areas is ripe with herring stories and accounts of the indomitable herring wives who followed the shoals of fish round the country. This is a Swedish dish and an excellent way of cooking your herring.