Tamping espresso is an important step when brewing espresso using a traditional espresso machine. Many at-home manual, semi-automatic, and even some automatic espresso machines require the user to tamp the espresso — making it a key skill to know to brew the perfect shot of espresso. Tamping espresso before brewing creates an even water flow for water to pass through the coffee grounds, ensuring full saturation for a great shot of espresso. Whether you’re brewing straight espresso shots or brewing espresso to use in espresso-style beverages, here’s everything you need to know about how to tamp espresso like a pro.
The purpose behind tamping espresso
Knowing how to tamp espresso is an important part of using a manual espresso maker. However, it’s most important to understand why tamping is so important to brewing a great shot over just understanding how to tamp espresso. Tamping your espresso allows for an even and balanced extraction, ensuring a balanced flavor in your brew.
“The main purpose behind [tamping your espresso] is to have a uniform and compact puck made of coffee grounds in the portafilter so that water passes through the grounds uniformly during extraction,” says Mark McShane, Chef & Food Safety Expert. “I start by spreading the coffee evenly in the basket; sometimes, I do a little tapping or even use a distribution tool to level it out before tamping. I then apply steady, firm pressure while keeping the tamper level to prevent the formation of sloped areas, which could result in channeling and uneven extraction. After tamping, I regularly do a quick wipe of the portafilter to get rid of the loose grounds before placing it into the machine,” he shares.
How to tamp espresso: Step-by-step
Learning how to tamp espresso involves only a few pretty simple steps. McShane shares how he tamps espresso below:
- Start by distributing coffee grounds evenly in the portafilter, ensuring there are no uneven spots.
- Put the tamper flatly on top of the coffee grounds and push down with force, ensuring it is firm and also of the same strength at all times. It is important that the tamper is kept level at all times. If it isn’t, sloping will occur, which causes channeling.
- Polish the surface with a slight twist, wiping off loose grounds on the edges.
- Lock the portafilter into your espresso machine and proceed with brewing your espresso shot.
Tips for tamping espresso
- Every day, tampers require cleaning to prevent the build-up of oil and coffee residues, which, in turn, affects the sliding of the tamper over the grounds. Clean your tamper regularly to ensure the best-tasting espresso.
- Use the right type of espresso tamper for your espresso machine. Flat tampers are most common, providing even compression for most espresso machines. Convex tampers can be applied to the center of the coffee bed to obtain a slight over-compression, which some baristas assert helps prevent channeling in small baskets, though this requires practice to master. In general, this type of espresso tamp is best reserved for more advanced baristas.
- Check for fit: The tamper must fit perfectly into the diameter of the portafilter with no gaps. McShane recommends using stainless steel for its longevity and comfortable handle shape. However, some baristas may prefer using heavier tampers, which provide a more stable press; on the other hand, lighter ones allow more control; it is a matter of personal feel and the machine’s design.
Common mistakes when tamping espresso
“The biggest mistake that is most common has been inconsistent pressure or uneven tamping. A good number of new espresso brewers either tamp the coffee too lightly, which results in under-extraction and thus the espresso is weak, or they tamp it unevenly, which leads the water to flow through the less dense parts more quickly, resulting in bitter or sour flavors,” says McShane.
“The third common mistake is one of “twisting” the tamper too hard, which, instead of merely polishing the coffee bed, disturbs it, thus making it hard for water to move through the coffee.” To avoid these common mistakes, be sure to use a proper grip and ensure that the coffee grounds are fully leveled before starting. Some coffee experts recommend holding the tamper like a doorknob with a straight wrist. A proper grip starts with placing your palm on the handle of your espresso tamper, applying stable, even pressure. With a bit of trial and error, you can learn how to tamp espresso with ease.
“Depending on the type of coffee bean and the grinding size, tamping may become a little different, McShane shares.” “Super fine coffee grinds usually go through a very firm, flat tamp to prevent over-extraction, while the coarse grinds might require a little less than full pressure so as not to completely block the flow. In the same way, when I am grinding, the coffee beans with more oil content might be slippery, thus I am being extra careful about leveling before tamping.”
