I have a simple Oster prima latte machine without pressurization filter and I have some difficulty extracting a well foamed coffee from it. Is it possible to achieve? I tried different things but every time I see this big holes on it and the coffee is usually more bitter than I expected.
I tried different powder thickness, toasting level, more or less pressure on tamper but any of these makes a lot of difference on the bitterness
by housepreto