Pulling a great espresso shot at home takes practice, and most beginners run into the same problems along the way. A bitter taste, a watery shot, or a pour that finishes too fast are all common, and all fixable. Here are five mistakes home espresso lovers make most often, and exactly what to do about them.
Frequently Asked Questions About
Mistakes Making Espresso
What are the most common mistakes beginners make with espresso?
Beginners most often struggle with grind size, tamping pressure, and water temperature. Grinding too coarse produces thin, sour shots. Tamping unevenly causes water to channel through weak spots in the puck, ruining extraction. Using water that is too hot scorches the coffee; using water that is too cool under-extracts.
- Use a fine, consistent grind sized for espresso
- Tamp with steady, level pressure (around 30 lbs)
- Brew between 195°F and 205°F for balanced extraction
Example: A beginner using pre-ground drip coffee in an espresso machine will almost always pull a weak, flavorless shot because the grind is far too coarse.
How can I fix a bitter taste in my espresso?
Bitterness in espresso usually signals over-extraction. This happens when water stays in contact with the coffee for too long, pulling out harsh, unpleasant compounds. The most common causes are a grind that is too fine, too much coffee in the portafilter, or a brew temperature that is too high.
- Coarsen your grind slightly to speed up flow
- Check your dose: 18–20 grams is standard for a double shot
- Lower brew temperature by 2–3°F and retest
Example: If your shot runs for 40 or more seconds and tastes harsh, start by adjusting the grind one step coarser before changing anything else.
Why is my espresso shot too watery, and how do I correct it?
A watery espresso shot is a sign of under-extraction. Water is moving through the coffee puck too quickly to pull out enough flavor and body. This is usually caused by a grind that is too coarse, an under-dosed portafilter, or weak tamping pressure that leaves the puck loose.
- Grind finer to slow down water flow through the puck
- Dose consistently: aim for 18–20 grams for a double shot
- Tamp firmly and evenly so the puck has no gaps or weak spots
Example: If your shot finishes in under 20 seconds and looks pale with little crema, try grinding one step finer and pulling again before adjusting anything else.
What should I do if my espresso is coming out too fast?
A fast-running shot, one that finishes in under 20 seconds, almost always points to too coarse a grind or an uneven tamp. Water finds the path of least resistance through the puck. If that path is wide open, it rushes through without extracting properly. The result is a sour, thin, underdeveloped shot.
- Dial your grind finer in small increments, one step at a time
- Re-tamp with firm, level pressure to close gaps in the puck
- Confirm your dose weight before blaming the grind
Example: A shot that pours like water from a tap within 15 seconds needs an immediate grind adjustment. Tighten the grind one notch, pull another shot, and check the time again.
How can I identify over-extraction in my espresso shots?
Over-extraction is easy to spot once you know what to look for. The shot runs slowly, often past 35 to 40 seconds. The color turns dark and muddy toward the end of the pour. The taste is dry, bitter, and sometimes ashy. A properly extracted shot finishes with a warm, caramel-colored crema and a balanced flavor that is sweet with a slight bitterness.
- Shot time over 35 seconds is a strong indicator of over-extraction
- Dark, thin crema with a burned color signals excessive extraction
- Bitter, drying finish with no sweetness confirms the problem
Example: If your espresso tastes like charcoal and leaves a dry, coating sensation on your tongue, your grind is too fine. Coarsen it by one step and pull a fresh shot.
