Very good, but I agree with the previous comment that it's a bit sweet as is. I'll up the brandy and dial back the grenadine next time, or maybe even try with the bonded instead of applejack.
I picked this one to use some of my new batch of grenadine. The sweet/spirit ratio is a little high for me. I’ll try again with 2 oz applejack and 0.5 oz grenadine to make it a little more spirit-forward.
December Morn — Rum, Apple brandy, Grenadine, Lemon juice, Egg white, Cinnamon