The Commodore is a classic cocktail that is rich and delicious. The recipe from in The Old Waldorf-Astoria Bar Book calls specifically for Bacardi and it is a nice rum for the drink as it could be called a "fancy" Bacardi Cocktail.
There is also an odd occurrence of the Commodore containing two syrups, which I think can get a little thick, especially with the egg and sugar. Thank goodness we have Chambord and other raspberry liqueurs that are not as thick but carry on the flavor.
Honestly, if you do not like sweet, this is not the drink for you because the only other element to offset that is a dash of lemon.
Strain into a chilled cocktail glass.
Commodore No. 2 Recipe
The Commodore No. 2 is quite a bit different than the Commodore [No. 1]. With only two common ingredients, grenadine and lemon juice, it is amazing that the two share a name. This is evidence that even in the early 1900's there were probably many bartenders creating drinks and duplicating names - something that is far more common today - but that's okay.
This Commodore is the fancier version of the two as it is served in a champagne glass and is an equal blend of bourbon, lemon and cacao. It sounds "interesting" but is one that you may want to check out because it is quite spectacular.
Shake all the ingredients with ice in a cocktail shaker.
Strain into a chilled champagne glass.