Hair of the dog: a festive OHMSS-inspired cocktail

“Never mind that. Go and get the brandy!”

1 measure brandy (e.g. Hennessy)
1/2 measure apple brandy (e.g. Calvados)
1/2 measure your favourite vermouth

Shake vigorously.

If you use Italian vermouth (red) it's a Corpse Reviver #1. Apt for the day after overindulgence!