Café FAQ – Plant Milk Guide

FAQ – Plant Milk Guide

Practical guidance for café teams working with plant-based milks every shift. Technique notes reflect general café practice; always follow the storage and food-safety information on your product label.

Explore our full range in the Alternative Milk collection, including our top-selling Milklab Oat Milk, Alternative Dairy Co. Barista Oat Milk, Milklab Barista Almond Milk, Alternative Dairy Co. Barista Almond Milk, Alternative Dairy Co. Barista Soy Milk, Bonsoy Soy Milk, Milklab Coconut Milk, and Alternative Dairy Co. Barista Coconut Milk.

1. Why does plant milk split in espresso drinks — and how do I reduce it?

Splitting (also called curdling or breaking) happens when acidity and heat cause proteins or stabilisers in the milk to coagulate. It is more common with high-acid espresso roasts, very hot milk, or milks not formulated for barista use. The following general practices help reduce the risk:

  • Use a barista-edition product. Barista-formulated milks contain additional emulsifiers and stabilisers designed to hold texture under espresso conditions. Our oat and almond ranges are our most-ordered barista products — see the links above.
  • Pour the milk first, then the espresso. Adding hot espresso directly onto cold milk creates a sudden pH and temperature shock. Pouring espresso into or onto pre-steamed milk at the correct temperature is a widely used technique to reduce splitting.
  • Steam to 55–65 °C. Overheating accelerates protein breakdown. Many baristas steam plant milk slightly cooler than cow's milk and serve promptly.
  • Check your espresso extraction. A very acidic or under-extracted shot puts more stress on plant milk proteins. Dialling in espresso for balance can reduce splitting across the board.
  • For iced drinks: Build over ice to cool the espresso before combining. Pouring espresso directly onto cold milk without an ice buffer can still cause localised splitting — pre-chilling your espresso shot or diluting it slightly before combining is common practice.
  • Keep milk cold until steaming. Milk sitting at room temperature begins to change in composition; refrigerate until the moment of use.

Technique results vary by product, machine, and espresso blend. Consult the product label or supplier for product-specific recommendations.

2. How should plant milk be stored after opening?

Always refer to the storage instructions printed on your product label. General guidance consistent with standard food-safety practice:

  • Refrigerate immediately after opening and keep at or below 4 °C.
  • Consume within the period stated on the label — typically 5–7 days for most barista plant milks, though this varies by product and brand.
  • Keep cartons sealed or tightly covered when not in use to limit exposure to other odours and contaminants in the cool room or fridge.
  • Do not return steamed or heated milk to the original carton. Once milk has been heated, it should not be recombined with unused cold product.
  • Unopened shelf-stable cartons can be stored at ambient temperature away from direct heat and sunlight. Once opened, ambient storage is no longer appropriate regardless of format.
  • Check the best-before or use-by date on each carton before service. Do not use product past its use-by date.

These points reflect general food-safety principles. The authoritative reference for each product is the label and your local food-safety regulator's guidelines.

3. What should I do with leftover steamed plant milk?

Once plant milk has been steamed, food-safety best practice is to treat it the same way as heated dairy milk:

  • Do not re-steam already-steamed milk. Re-heating causes further protein breakdown, degrades texture, and increases food-safety risk.
  • Do not return steamed milk to the original carton or a shared cold pitcher. Mixing heated product back into cold, unused milk compromises the entire batch.
  • Discard steamed milk that has not been served within a short holding period. Most food-safety frameworks recommend discarding heated milk not served within 30 minutes; check your local food-safety authority's guidelines for the applicable standard in your jurisdiction.
  • Use small steaming pitchers sized to the order rather than large batches. Steaming per order or in small volumes is the most practical way to reduce leftover steamed milk waste.
  • For cold brew and iced drinks: Cold, unheated plant milk from an open carton that has been kept refrigerated and within its label-stated window can be held at temperature and used. Once any portion is heated, the above rules apply.

For food-safety decisions, defer to your local regulator's requirements and your café's food-safety plan over general guidance.

Shop our plant milks

Find our full range — including barista oat, almond, soy, and coconut — in the Alternative Milk collection.