This section is from the book "The White House Cook Book", by Hugo Ziemann, F. L Gillette. Also available from Amazon: The White House Cook Book.
Three ounces of grated chocolate, one-quarter pound of sugar, one and one-half pints of cream, one and one-half ounces of clarified isinglass, or gelatine, the yolks of six eggs.
Beat the yolks of the eggs well; put them into a basin with the grated chocolate, the sugar and one pint of the cream; stir these ingredients well together, pour them into a basin and set this basin in a saucepan of boiling water; stir it one way until the mixture thickens, but do not allow it to boil, or it will curdle. Strain the cream through a sieve into a basin, stir in the isinglass and the other one-half pint of cream, which should be well whipped; mix all well together, and pour it into a mold which has been previously oiled with the purest salad oil, and, if at hand, set it in ice until wanted for table.

Take one quart of milk, and when nearly boiling stir in two ounces of grated chocolate; let it warm on the fire for a few moments, and then remove and cool; beat the yolks of eight eggs and two whites with eight tablespoonfuls of sugar, then pour the milk over them; flavor and bake as any custard, either in cups or a large dish. Make a meringue of the remaining whites.
 
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