When dial in the espresso, it is important that you know what type of coffee you are dealing with. That is why it is important that you can read the label of a coffee bag. A dark roast will always have more bitter notes and a lighter roast will always taste slightly more sour than a dark coffee. So know what to expect when you buy a coffee.
Once you’ve found your coffee’s settings, write them down somewhere. If you want to buy the same coffee again, you already have all the settings at hand. These variables are useful to note: the name of the roaster, the name of the coffee, grind size (which position the grinder is set to), how many grams of coffee you used, how long it took before the coffee was brewed and how many grams espresso you brewed.
You may have brewed the coffee perfectly but you don’t like the coffee very much. Then that coffee bean is not your taste. There are many different types of coffee beans that all have their own taste. Just try a coffee from another country or continent.