FISH À LA BRUNSWICK

Cook any large fish in salted water, adding one cupful of vinegar, and sliced onions, celery root, and parsley to season. For the sauce mix the yolks of two hard-boiled eggs with the yolks of two raw eggs, add a teaspoonful of prepared mustard, and a little salt, pepper, vinegar, lemon-juice, chopped parsley, onion, capers, shallots, and chopped pickle. Mix to a smooth paste with oil, add the finely chopped whites of the eggs, spread over the drained fish, and serve.