Pretty easy to make -- they simply call for a 2:1 ratio of scotch and sweet vermouth. Here's a similar recipe, yet with a little different take:
The "Scotch Manhattan" indeed. For those of you out there who may not like scotch, this drink may be an opportunity to ease into it and end up liking it! Regardless, this drink is perfect for these winter nights that don't seem to be leaving any time soon.