For the truffles, combine coffee and water in a small bowl or ramekin and whisk to dissolve.
In a medium saucepan over low heat, combine coffee mixture, sweetened condensed milk, chopped chocolate, powdered erythritol and butter. Whisk constantly until chocolate has melted and mixture is smooth. Remove from heat immediately (don't let it overcook, your chocolate will seize).
Cover with plastic wrap flush to the surface and refrigerate 2 hours.
Once mixture is firm, roll into scant 1-inch (or even less) balls and roll in your favourite coating(s).
Notes
Makes 36. Each truffle has 2.3 g of carbs and .9 g of fiber. Total NET CARBS = 1.4 g (these counts are based on coatings of cacao nibs or cocoa powder)A serving is 2 truffles...if you can stop at just 2!!!