This seemingly impossible feat is performed by something called “skinny Russian pie.” The recipe turned up on a tag attached to a new product that is just what’s needed for this time of year. It’s Sweet ‘N Low Coffee Liqueur, an almost sugarless drink formulated and produced in Mexico.

Only enough sugar is added to meet the legal definition of a liqueur, says Albert Berentsen, president of Light Spirits International, a Glendale-based company that is importing the product. Then Sweet ‘N Low sugar substitute takes over. Berentsen, who supervised the development of the formula at a lab in Mexico City, says the calorie content is about half that of other coffee liqueurs.