How do I dial in my espresso?

Dialing in espresso is the art of balancing the variables of your coffee recipe to highlight the best flavors in your beans. Because espresso is a high-pressure extraction, even tiny changes in your grind size or dose can drastically alter the final taste. The goal is to find the 'sweet spot' where the acidity, sweetness, and bitterness are in harmony.

To begin, you need a consistent starting point. Most baristas use a 1:2 ratio—meaning if you put 18 grams of dry coffee into your portafilter, you aim for 36 grams of liquid espresso out. Start by timing your shot; if it pulls in under 25 seconds, it is likely under-extracted and will taste sour or thin. If it takes longer than 30 seconds, it may be over-extracted, leading to an unpleasant, drying bitterness.

Grind size is your primary tool for troubleshooting. If your shot is too fast (sour), adjust your grinder to a finer setting to increase resistance. If your shot is too slow (bitter), adjust to a coarser setting. Always make small, incremental changes—don't jump from one end of the dial to the other. After each adjustment, purge a small amount of coffee from the grinder to ensure the new setting is actually what is being dispensed.

Remember that coffee is a living product; as beans age, they lose moisture and CO2, which means you will need to adjust your grind size slightly finer over the life of the bag to maintain the same extraction time. Dialing in isn't a one-time task, but a continuous process of sensory analysis. By keeping your dose and water temperature constant, you can isolate the grind size as the variable, making it much easier to achieve that perfect, syrupy shot every morning.