These bars were a big hit on a recent Bickie Thursday!! You'll find the recipe in The Gourmet Cookbook, by Ruth Reichl, (Houghton Mifflin, 2004, $40) They're easy, elegantly attractive, and the recipe yields 4 dozen bars!   Not too sweet, and including 3 tablespoons of instant espresso powder, so they're plenty strong with the good bittersweet chocolate.  Look for the recipe on page 694. Enjoy!