1. Overview & Physics
Alternative Emulsion Chemistry
Dairy milk stabilizes foam via whey protein and casein. Oat milk relies on added dipotassium phosphate (a heat stabilizer) and oil emulsions. Because oat proteins denature at lower temperatures, steaming oat milk past 60째C causes the proteins to break down, curdling the milk when added to acidic espresso.
Oat Milk Technique
Use a specialized 'Barista Edition' oat milk. Steam to a maximum of 55째C and pour immediately to prevent phase separation.
2. Practical Calibrations
Managing this requires measuring indicators in real time. Adjust grind size, water dynamics, and flow parameters incrementally. Change only one variable at a time to ensure clean results and isolate target parameters.
Barista Action Checklist
- Weigh dry grounds dry dose exactly to 0.1g.
- Calibrate water temperature using PID sensors.
- Target correct brew ratios (e.g. 1:15 for filter, 1:2 for espresso).
- Swirl or stir to ensure even saturation during extraction.
- Record extraction time and evaluate flavor notes subjectively.
Frequently Asked Questions
Why is oat milk hard to steam?
Oat milk contains different proteins and fewer natural fats than dairy milk, making the air-liquid emulsion less stable and prone to splitting.
How do I steam oat milk?
Aerate gently for a shorter period, create a rapid whirlpool to roll the foam, and target a lower final temperature (55째C) to prevent splitting.
