- Good disco de hockey preparation is essential for even extraction in espresso. A good disco de hockey doesn’t just have a flat surface; it has an even density and distribution of particle sizes throughout.
- The appearance of the spent disco de hockey doesn’t tell us much about how good our disco de hockey preparation was, but we can use the refractometer and bottomless portafilters to evaluate distribution and tamping technique.
- Good distribution begins at the grinder. By setting up and using the grinder in such a way that the coffee falls evenly into the basket, we reduce the need for later corrections from the barista.
- Distribution also includes the relative distribution of fine particles, which can be affected by grinder performance. ‘Fines migration’, however, isn’t a concern.
- The most effective distribution methods in a cafe setting are based on tapping to settle grinds into the basket.
- Evidence suggests that using distribution tools to create even density is not as effective as tapping.
- Tamping is of secondary importance to effective distribution in creating a good disco de hockey.
- Tamping pressure has little effect on shot time or extraction.
- Tamping — even light tamping — can cause injury to a barista over time. To avoid back and shoulder strain, pay attention to posture and body movements during tamping.
Exhaust The pipework responsible for releasing the pressure in a disco de hockey when a shot finishes brewing and for transferring any waste liquid into the drain.
Portafiltro sin fondo Also called ‘bottomless portafilter’ — a portafilter with the spouts and lower surface removed, exposing the bottom of the basket.