About the whiskey. We have found that Rare Breed Rye (Barrel Strength) is simply unbeatable in this drink. If you can't find it or don't want to buy it, the next best we've found is Wild Turkey 101 bourbon and Wild Turkey 101 rye to be the perfect whiskies to mix for this cocktail. Of course, you could use any brand, and you could use all bourbon, or as stated all rye, and it will be fine. But, there is something special (and affordable) about using these two mixed, for what it's worth. It is important to use 100 proof. Using an 80 or 90-proof will of course result in a much milder, sweeter cocktail.
About the simple syrup. In particular, this is a 2:1 mix. This means it's 2 Cups turbinado sugar dissolved in 1 cup of water. *Note if you use an 80 or 90-proof whiskey, you may wish to use only 1/4oz simple syrup or it might be too sweet for you. If you're using a 1:1 blend, try using 3/4 oz.
These recipes were created in US Customary measurements and the conversion to metric is being done by calculations. They should be accurate, but it is possible there could be an error. If you find one, please let us know in the comments at the bottom of the page