I have a drink I like to make using powdered coffee, a coffee grind finer than espresso. but when I try to make it in an espresso machine, the powder expands, and only the first few drips come out. (its delicious) Then the espresso machine will nearly explode, as the heat builds, and the pressure cannot escape.
what is out there for high pressure espresso machines? I would also like to make a gaurana drink in a similar fashion, but I think it would be the same issue, with tiny particles expanding when wet, and clogging the holes in the press.
To be perfectly clear, I mean very fine ground coffee, which is in a powder, and not freeze dried coffee.