Beer tapped over a period of three to four minutes avoids oxidation, removes excess carbon dioxide and compacts the head.

First step
Mug cleaned with water jet

 Second step
Mug filled with foam that shortly after becomes a half liter of beer		 Third step
Mug completely filled with beer		 Fourth step
The job is done with the creation of a perfect head

A beer that after a minute has lost more than half of its head is not a quality beer. For the Bavarians the head should last at least five minutes.