Why did my homemade hot chocolate separate into "slime"?
I made it with whole milk, a little half and half, bittersweet chocolate, cocoa powder, sugar, cinnamon, chili and cayenne. It was fine at first but after I heated it up a little later while whisking continuously, the bottom third developed into a viscous dark chocolate slime. It's the weirdest thing. I've never had that happen and am not sure what caused it.
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That's why I don't get sludge if I drink the cocoa right after heating or with benefit of the blender.
The cocoa and fat attractions still there, but doesn't have time to bind.
It happens to me sometimes - a coalescing of some undissolved chocolate matter at the bottom of the cup, though not so bad as slime - if I don't mix thoroughly or drink while still hot.
I do two things to prevent this occurring:
1) mix a small amount of cocoa powder with (cold) milk before adding hot milk or heating the whole mixture.
2) make the cocoa paste as in #1, but also blend mechanically - blender, processor or the like. Especially worth it if you're making a batch, not just one cup.
Also here are some tips to avoid lumps, which may help in preventing future slime.