This section is from the book "The White Ribbon Cook Book", by Kathryn Armstrong. Also available from Amazon: The White Ribbon Cook Book.
One or more cod's roes, 1 1/2 oz. of butter, 2 eggs, 1 teaspoonful of salt, 1 pinch of cayenne pepper, 1 grate of nutmeg, 1 dessertspoonful of tomato sauce or vinegar.
Boil 1 or more cod's roes, according to size, till quite set and nearly done. Take them out of the water, and when cold cut them into slices of an inch thick. Now put into a small stew-pan 1 1/2 oz. of butter; when made liquid over the fire, take it off and stir into it the yolks of 2 eggs, a small teaspoonful of salt, a pinch of cayenne pepper, a grate of nutmeg, and a dessertspoonful of tomato or Mogul sauce, or the vinegar from any good pickle. Mix all well together and stir it over the fire for 2 or 3 minutes to thicken. Dip the slices of cod's roe in this sauce to take up as much as they will, lay them in a dish, pour over them any of the sauce that may be left, put the dish into the oven for 10 minutes, and send to table very hot.
 
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