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I mean, if you put cream in your coffee... that's basically liquid butter with some whey in it.

No, the actual experience is a significant departure from using cream, or milk products, or imitations of milk.

It floats on the top, in beads, like a soup broth.

One of those immersive hand mixers for 10s or so can turn it into an emulsion, which is much more pleasant.

Just needs an emulsifier. Butter and egg coffee, now that'd be something.