Molasses Posset for a Cold

Take a pint of the best molasses, a tea-spoonful of powdered ginger, a quarter of a pound of fresh butter, and let them simmer together for half an hour: then stir in the juice of two lemons, or if you have not these, two table-spoonsful of strong vinegar; cover over the sauce-pan, and let it stand by the fire five minutes longer. Some of this may be taken warm or cold.

Source: Domestic Cookery, Useful Receipts, and Hints to Young Housekeepers, Elizabeth E. Lea