Preheat oven to 400 degrees. Peel and cut the potatoes into fine julienne, don't put them in cold water. You will need the starch to thicken the dish. If they become red or gray simply rinse them off quickly and dry them off with a paper towel. Slice the onion into fine slices. Cut the ansjovis (matjes) into small pieces. Butter an oven proof pan and layer the potato, onion and the ansjovis. Begin and finish with the potato. Salt and pepper between the layers. Mix the milk, heavy cream and the marinade and poor it over the dish. Spread a thin layer of bread crumbs on the top and bake it for 50 to 60 minutes, or until the potatoes are nice and soft.
This recipe was provided by a chef, restaurant or culinary professional. It has not been tested for home use.
Recipe courtesy Ulrika Bengtsson, Ulrika's Restaurant, New York City, NY