SOUR - Temperature or grind size could be the culprit. If you want to lower the temperature, run water through the brew head and try your shot again. Too fine of a grind will result in a slow, over-extracted shot that can taste bitter. BITTER - Temperature or grind size could be the culprit. I like to smooth the basket down with a light tamp to make sure the grounds are even within the basket. Brush the edges of the filter basket off so there are no stray coffee grounds to get into the threads of the brew head. Pressurized portafilters (generally) do not need tamping down. Select a darker espresso roast instead of a lighter Italian-style espresso roast to get the extra-strength goodness you crave. STRONG - Just because you love a strong shot of espresso doesn’t mean you need to fill the filter basket up and tamp it so tight that it barely locks into the brew head. You can experiment to find the amount you think tastes best with your coffee and your machine and be able to repeat the same dosage in the future. A double basket holds somewhere between 14-18 grams of ground coffee. Your machine includes a compatible single and/or a double basket. Each portafilter basket is a little different in terms of size and shape. WEAK - Not enough coffee dosage or too coarse of a coffee grind, or both. Tamper - the chess-piece looking tool that fits just on top of the filter basket with enough room to press the espresso grounds down evenly. Does the grind feel coarser than flour but finer than table salt? Some say powdered sugar is a good correlation for an espresso grind. Espresso Fine Grind - espresso requires a grind size finer than what is used for drip coffee. Burr Grinder - a grinder suited for espresso because the whole beans are ground through two adjustable discs instead of revolving blades resulting in a finer and more uniform grind. Pressurized Filter Basket - a filter basket that has fewer holes, smaller holes, and/or a mechanism that increases the pressure in addition to the bar pressure of the espresso machine. Also called a brew group, especially on commercial espresso machines. Brew Head - the exposed part of the espresso machine that the portafilter filter locks into. Portafilter - the handle that holds the filter basket where you place the ground espresso.
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