speed to low and add the dry ingredients in 3 additions, mixing only until a dough forms. mix in the chocolate, then turn the dough out onto a clean work surface.
divide the dough in half. roll each section of the dough into 12-inch-long logs. flatten both logs with the palm of your hand, so that they are ½ to 1 inch high, about 2 inches across and sort of rectangular, then carefully lift the logs onto the baking sheet. sprinkle each log with a little sugar.
bake the logs for about 25 minutes, or until they are just slightly firm. the logs will crack a little. remove the baking sheet from 