The following recipe was published in a very popular German cookbook that was translated into English in 1897.
Chocolate Caramel. Take 1/2 pint of rich milk and put it to boil in a porcelain kettle; scrape down 1 1/2 squares of chocolate, put it into a very clean tin cup and set on the top of a stove until it becomes soft. Let the milk boil up twice. Then add, gradually, the chocolate, and stir both over the fire until thoroughly mixed and free from lumps. Stir in 1/2 pint of the best powdered sugar, and 4 large tablespoonfuls of molasses. Let the whole boil fast and constantly (so as to bubble) for at least 1 hour or more, till it is nearly as stiff as good mush. When all is done add a small teaspoonful of essence of vanilla, and transfer the mixture to shallow tin pans, slightly greased with very nice sweet oil. Set it on ice or in a very cool place, and while yet soft mark it deeply in squares with a very sharp knife. When quite hard cut the squares apart. If it does not harden well it has not been boiled long enough or fast enough.
HENRIETTE DAVIDIS'
Practical Cook Book
COMPILED FOR THE UNITED STATES FROM THE
THIRTY-FIFTH GERMAN EDITION.
1897