Finally! A million thanks to vf for finding the bona fide recipe before I started baking Claudia Flemming's chocolate chip cookies (which I might save for a future project). The MM recipe is a keeper for sure. I might have to coerce his staff into telling me what kind of chocolate they're using over at the restaurant.
If only I had time to make the accompanying root beef float made with homemade root beer sherbet and sassafras ice cream!