This section is from the book "The White Ribbon Cook Book", by Kathryn Armstrong. Also available from Amazon: The White Ribbon Cook Book.
One tablespoonful flour, sugar or molasses, 1 oz. butter, 1 tablespoonful lemon juice.
Mix a tablespoonful of flour quite smooth in 4 tablespoonfuls water, then stir into it 1/2 pint boiling water, sugar or molasses to taste; stir over the fire until the sauce boils, when, if allowed, an ounce of butter may be added, with a tablespoonful of lemon juice. When sweetened with sugar, a little nutmeg or ground cinnamon may be used instead of lemon juice, if preferred. A tablespoonful of raspberry jam or any fruit syrup may be used to flavor the sauce, and is generally much liked.
 
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