Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   1                    potato per person
   1 1/2  ounces        smoked salmon per person
   2      tablespoons   or 3 tablespoon sour cream per -- person
                        a few tablespoons red or -- black caviar per
                        -- per

Preparation:

Here's one from the British Consulate. From Julia Burton, wife of British Consul General Graham Burton. Wash the potato. Prick with a fork and rub with salt. Bake in a 350F oven until potato is tender, about 1 hour. Cut in half and scoop out the flesh without breaking the skin, leaving only a thin layer of potato on the inside. Chop the smoked salmon and divide between potato halves. Spoon in 2 or 3 tablespoons of sour cream and top with red or black caviar, or some of each. Serve. From the San Francisco Chronicle, 6/15/88