Forty guests arrive by tender in ninety minutes and the menu promises three signature cocktails. You cannot shake 120 drinks to order with two stews and one shaker. Batching done properly is more consistent than anything made by hand — done badly, it is why the second round tastes nothing like the first.
What Can and Cannot Be Batched
| Batches well | Batches badly |
|---|---|
| Spirit-forward stirred drinks (Negroni, Manhattan) | Anything with egg or dairy — it separates |
| Punches and long mixed drinks | Sparkling components — they go flat |
| Sours, if citrus is fresh and the batch is used that day | Anything needing foam or fresh crema at service |
The rule: batch the stable part, add the fragile part at the glass — for a spritz, batch only the Aperol.
Dilution in the Batch
Batch a Negroni, pour it over ice, and it arrives undiluted — hot and harsh — reaching balance only when the ice has half melted.
- Add water to the batch to replicate the dilution stirring or shaking would have given.
- Stirred batch: roughly 20–25% of total volume as water. Shaken batch: 25–30%.
- Chill the batch hard, and taste it against a single drink made to spec before you bottle it.
- Bottled cocktails: pre-diluted, chilled, sealed, labelled and dated. Non-citrus batches keep for weeks; citrus batches do not.
Syrups and Homemade Ingredients
| Ingredient | Method | Keeping |
|---|---|---|
| Simple syrup (1 : 1) | Dissolve sugar in water | Refrigerated, ~2–4 weeks |
| Rich syrup (2 : 1) | More sugar, more viscous | Longer — sugar is the preservative |
| Gum syrup | Simple syrup + gum arabic | Silky texture |
| Oleo saccharum | Citrus peel + sugar, which draws out the oils | Days; the basis of a punch |
| Cordial | Fruit, sugar, often acid | Days to weeks |
| Shrub | Fruit, sugar and vinegar | The vinegar preserves it; keeps well |
Label and date everything. An unlabelled bottle is a bottle you throw away. High sugar and high acid mean long life; fresh and low-sugar means short.
Food Safety at the Bar
Everything that goes into a glass is food.
- Fresh juice is not shelf-stable — press close to service and discard on the vessel's schedule.
- Raw egg white carries a real salmonella risk. Use pasteurised egg white or aquafaba wherever the vessel's food-safety system requires it — and with elderly, pregnant, very young or immunocompromised guests, it does.
- Dairy and cream liqueurs: refrigerate, date, respect the use-by.
- Cut garnish and ice are food: covered, chilled, dated, handled with tongs.
- Most yachts run a HACCP-based system. It applies to the bar.
Responsible Service
- Watch behaviour, do not count drinks — speech, coordination, mood.
- Slow the service: longer builds, more ice, water and food offered unasked.
- Never serve a visibly intoxicated guest, and never a minor.
- Be alert around tenders, water toys and swim platforms.
- Escalate. Cutting off an owner or charter guest is not your decision alone — but do not keep pouring while you wait.
Onboard Notes
- "The guest insisted" is not a defence at an inquiry.
- A batch left at ambient temperature all afternoon in the tropics is not a batch. Ice it or bin it.
- xplor is not an accredited GUEST provider. GUEST is governed by IAMI and certified only through approved GUEST Training Providers; nothing in this course awards or counts toward a unit or certificate.