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Put hot water inside the chamber just below the valve. Too much air will have your coffee pop out too fast, the process must be as slow as possible.
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As soon as coffee starts to spill, turn down the heat to minimum and shut it off when 1/3 or 1/2 of the pot is filled. The rest will flow anyhow and you don't get a "tea-like" coffee.
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Most important: coffee brewing with Moka or Expresso machines strongly depends on atmospheric pressure. You should grind yourself your beans accordingly to weather: good weather (high pressure) will need a finer ground, bad weather will need a coarser ground.
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The quality of the final products depends also on the filter holes size.
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On the latest bialetti pots, the external side of the valve have a pin on it. Before brewing your coffee, move that pin like a joystick for a few seconds, that cleans the valve for a perfect performance.
Get your ground coffee at a size calculated this way: X = espresso size Y = suggested moka size.
Perfect size = X - - P - - - -Y