At its simplest, Rock and Rye was little more than rye whiskey, its edges rounded out by a little rock candy syrup. Indeed, that was how Harry Johnson prescribed it in his 1882 Bartender’s Manual. It was a simple preparation: the barkeep only needed to place a whiskey glass in front of the customer, pour in some rock candy syrup, place a spoon in the glass, and “hand the bottle of Rye whiskey to the customer, to help himself.”