I was quite surprised by this relatively simple combination, which seems like it ought to be a well-known classic. Granted, in proportion and construction, it's basically a Collins, but with some signature ingredients.
2 oz white whiskey (I used the local MN13 - good stuff!)
1 oz peach-brown sugar syrup
3/4 oz lemon juice
Combine in a tall glass over large cubes, stir, top with about 2 oz soda water, and stir again.
This version, the Remington, is quite a good one. However, the simplicity of this combination makes it easy to swap out the peach for other flavors. To wit:
For a Derringer, use cinnamon-brown sugar syrup.
For a Palomino, use vanilla-brown sugar syrup.
For a Caballero, use ancho chile-brown sugar syrup (yum).
How that's for a post - not just one cocktail, but 4 in one go! Don't be silly, it's not cheating at all.