Make-ahead espresso martinis for a party
Pre-batch the liquid, chill it thoroughly, and shake individual servings for the best texture.
Batch the liquids
Combine vodka, coffee, liqueur, and syrup using the party calculator. Refrigerate in a sealed container.
Do not add ice early
Water from melted ice changes the balance. Add ice only when shaking each round.
Shake smaller rounds
For consistent foam, shake one or two drinks at a time. Overfilling the shaker reduces aeration.
Keep service cold
Chill glasses and the batch. Stir the batch before pouring because coffee can settle.