This dispensing technique results in a thick creamy head and product whose gas content has been lowered slightly during the pour. Barmen is dispensed in this fashion and they required the retailers to be trained on the seven minute pour before they could even purchase the brand.
I believe that the initial pour is straight up until the foam reaches almost to the top of the glass and then you stop. Then the product stands until the foam settles and the process is repeated. Each time the beer is dispensed into the glass the foam head becomes thicker and begins to resemble an ice cream cone. After repeating fiver or six times, the end result is this blossoming head on top of the an almost full glass. A tapered footed pilsner glass is very popular with this pour.
Scott Zuhse, Instructor
Micro Matic Dispense Institute