The Old-Fashioned Manhattan

I was lucky enough to be invited to a Xmas Eve soiree by the wonderful Sletholts this past year.  I arrived armed with an idea for a new whiskey drink as per Gina's request.  As I've been told the drink was a hit, I've decided to share.

The Old-Fashioned Manhattan
2 parts Bulleit Bourbon (You don't have to use Bulleit.  It's just what I prefer.)
3/4 parts Grand Marnier
1/2 part sweet vermouth
1 or 2 dashes of angostura bitters (If you've got them. Of course I have them.)
Splash of simple syrup (Entirely optional.  Sometimes I add it. Sometimes I don't.)
2 brandied or maraschino cherries
1 strip of orange peel (Run a flame along this for a couple of seconds and then twist to release some of the oils.  Run it along the rim of the glass before dropping in the drink.)
Club Soda (Serve drink in rocks glass, obviously on the rocks.  After adding everything else, give the drink a couple of heavy splashes of the club soda.  You could make this drink without the club soda but the soda mellows out the harshness of all that booze nicely.  Makes for a more pleasurable sip.)

A bit of advice.  If at all possible, drink these standing up.  If you drink 2 or 3 of The Old-Fashioned Manhattan sitting down, you may find standing up again to be more difficult than normal.