I emailed them last year when I heard of this , I got this reply-
What is brewed milk? What do we mean by animal-free? How can we create dairy that’s got casein and is vegan?
The answer, friends, all comes down to a little, yet mighty yeast we lovingly call Buttercup. Think of Buttercup as our “cow.”
To make Buttercup, we started with a standard yeast, which we received from the USDA, and gave her a “blueprint” in the form of 3D printed cow DNA (no animals needed, not even for the DNA). Voila. Buttercup — our milk protein-making machine — is born. This yeast can now ferment sugar into casein and whey proteins, identical to the ones produced by a cow. Plus these proteins are 100% vegan and food safe.
We then carefully separate these proteins and combine them with plant-based fats, non-lactose sugar, and micronutrients to produce milk that tastes great and is better for the planet. Plus, it can be used to make stretchable cheese, creamy yogurt, rich ice cream…. [we’re drooling over here. You?]
Cheers,
Ryan and Perumal