If you don't tamp enough (undertamp) when making espresso, water flows through the loose coffee grounds too quickly, causing channeling, resulting in an under-extracted shot that tastes weak, watery, sour, and lacks body and sweetness, with thin crema. You'll often see an uneven or very fast pour, with the puck cracking or breaking apart, because the grounds aren't sufficiently compacted to create resistance and a uniform puck structure.
If you don't tamp firmly enough or evenly, water will rush through the coffee too fast. This makes your espresso taste weak and sour. It also means your shots will be inconsistent, with flavors changing from one cup to the next.
You can't truly "over-tamp" to the point of ruining a shot because coffee grounds reach a maximum density, but tamping too hard can create issues by making the puck too resistant, slowing extraction, and potentially causing bitter, over-extracted coffee or channeling if done unevenly, though the primary problem is usually insufficient tamping which leaves air pockets, leading to poor saturation and weak coffee. The goal is firm, consistent pressure until the grounds no longer compress, removing air, not excessive force that stops water flow.
Apply 20-30 pounds of pressure, and polish
Baristas often recommend 30 pounds of pressure, but some do as little as 20 pounds.
Signs of Under or Over-Tamping: Under-tamping leads to fast water flow and weak espresso, while over-tamping slows water flow and creates bitter flavors.
The "espresso 30-second rule" is a widely used guideline suggesting an ideal espresso shot should extract in 25-30 seconds for a balanced flavor, acting as a starting point for dialing in your grind size and brew ratio, though taste remains the ultimate judge, as factors like roast level and machine type can alter this. Timing usually starts when the pump activates, but some prefer from the first drip; shots under 20 seconds are often sour (under-extracted), while over 35 seconds can be bitter (over-extracted).
The 80/20 rule for coffee (Pareto Principle) means 80% of your flavor comes from 20% of the effort, focusing your energy on key variables like fresh, quality beans, proper grind size, good water, and correct ratio, rather than obsessing over every minor detail. It suggests prioritizing high-quality beans and core techniques to get the best flavor, recognizing that superior beans in a decent brew beat average beans in a perfect brew, with the remaining 20% of effort refining the process for a great cup.
The "espresso 2:1 rule" refers to the common guideline of a 2:1 brew ratio, meaning the weight of the liquid espresso yield should be twice the weight of the dry coffee grounds used, e.g., 18g of grounds producing 36g of espresso, often within 25-30 seconds for a balanced "normale" shot. While a great starting point for consistency (like 19g in, 38g out), it's a flexible guideline, not a strict law; adjust ratios (shorter for ristretto, longer for lungo) and timing to taste for different beans and preferences.
In general, TSS symptoms can develop as soon as 12 hours after a surgical procedure. Symptoms usually develop in 3 to 5 days in individuals who are menstruating and using tampons or menstrual cups.
That, paired with a tiny tear from something like pulling out a dry tampon before it's saturated with blood, can introduce the bacteria into the body. "Use the lowest absorbent type of tampon necessary for your flow," Tyson suggests, to avoid bacteria growth and micro-tears in the vaginal wall.
Menstrual blood on the string: Seeing blood on the string is a sign that you might soon have a leaky tampon. If you notice this, it's probably time to change.
COFFEE TERMS:
Too fine of a grind size will result in over-extracted coffee. Too coarse of a grind size will result in under-extracted coffee. Somewhere in the middle is your perfect cup.
30 pounds of pressure equals 7.3 pounds per square inch.
Step by Step Guide
The "2-hour coffee rule" suggests waiting 90 minutes to 2 hours after waking up to drink your first cup of coffee to optimize caffeine's effects, avoid interfering with your natural cortisol spike (which peaks shortly after waking), and potentially prevent afternoon energy crashes. This timing allows caffeine to work better when cortisol levels naturally drop and adenosine (the chemical that makes you sleepy) builds up, leading to better focus and alertness later in the day, though individual experiences vary.
If your shot is still running fast, try these additional adjustments:
So, while you can get a stronger taste from a coarser grind by steeping for longer, when it comes to a punchy caffeine hit, finely ground is the only way to go! The more finely ground the beans, the more caffeine is released into the water.
The hardest thing for a barista to make is a Ristretto. This coffee extraction is known for its precise balance, being the first part of an espresso shot that's smoother and sweeter.
The 4 M's of Espresso — Miscela, Macinatura, Macchina, Mano. (That's blend, grind, machine, and hand — for the non-Italian speakers.) Let's break it down the 787 Coffee way, so you can make better coffee at home, learn more about the process, and fall even deeper in love with what's in your cup.
The Golden Rule
A reliable method for judging your extraction times is by following the “Golden Rule” which states that a double shot of espresso should result in about 2-2.5 fluid oz and take about 20-25 seconds to extract.
How Many Espresso Shots in a Day Are Safe to Drink? Espresso is small but strong. For most adults, 4 to 5 espresso shots a day is the limit. Go over that, and you risk jitters, anxiety, or worse.
The 25–30 Second Sweet Spot
Every coffee bean, roast level, and grinder setting affects how fast or slow your espresso extracts. But as a rule of thumb: 25–30 seconds = balanced shot. <20 seconds = under-extracted (sour, weak, watery)