Chocolate
This rule, though unlike that given in cook-books generally, makes a drink in consistency and flavor like that offered at Maillard's or Mendee's, the largest chocolate manufacturers in the country.
Instructions
Scrape or grate fine two squares (two ounces) of Baker's or any unsweetened chocolate. Add to this one small cup of sugar and a pinch of salt, and put into a saucepan with a tablespoonful of water. Stir for a few minutes till smooth and glossy, and then pour in gradually one pint of milk and one of boiling water. Let all boil a minute. Dissolve one heaping teaspoonful of corn-starch or arrow-root in a little cold water, and add to the chocolate. Boil one minute, and serve. If cream can be had, whip to a stiff froth, allowing two tablespoonfuls of sugar and a few drops of vanilla essence to a cup of cream. Serve a spoonful laid on the top of the chocolate in each cup. The corn-starch may be omitted, but is necessary to the perfection of this rule, the following of which renders the chocolate not only smooth, but entirely free from any oily particles. Flavor is lost by any longer boiling, though usually half an hour has been considered necessary.
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Source
The Easiest Way in Housekeeping and Cooking (1903)