This section is from the book "Queen's Of Cuisine", by Martha Logan. Also available from Amazon: Queens of Cuisine.
1 pound Swift'ning for deep fat frying.
1 cup milk.
1/2 cup flour.
3 Spanish onions.
1 1/2 teaspoons salt.
Heat Swift'ning slowly, in deep kettle, to 350° F. (Cube of bread browns in 60 seconds.) Peel and slice Spanish onions 1/4-inch thick. Separate rings. Dip into milk, then into flour and salt which have been sifted together. Fry a few onion rings at a time in hot Swift'ning until golden brown, 5 to 7 minutes. Drain well over kettle, then place on tray covered with absorbent paper. Serve hot.
5 to 7 minutes.