This section is from the book "A Handbook Of Invalid Cooking", by Mary A. Boland. Also available from Amazon: Handbook of Invalid Cooking.
Select any white fish - fresh cod for instance. Prepare it according to the directions given for cleaning fish, put it into a wire vegetable-basket, drop the basket into a dish of boiling salted water, and let it simmer for from fifteen minutes to three quarters of an hour according to the size of the fish (a cod weighing three pounds will require cooking a half hour). Do not allow it to boil rapidly at any time, or it will break. When it is done lift it out of the basket and serve it at once with drawn butter made in the following manner:
Put two tablespoons of butter and one of flour into a saucepan; let them simmer together for two minutes (count the time); then add, a little at a time, a pint of boiling water or of chicken broth, stirring constantly. This will give a smooth cream-like sauce which will be enough for two pounds of fish. Season it with parsley, grated yolks of hard-boiled eggs, a few drops of lemon-juice, a bit each of cayenne and mustard, and a few drops of onion-juice.
 
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