One change. A better next cup.

Treat a diagnosis as a hypothesis

Acidity can be a bean characteristic you dislike, rather than a mistake. Bitterness can come from roast flavor, dirty equipment or brewing. Strong and bitter are not synonyms. Before adjusting, let the cup cool enough to taste, check the recipe and inspect cleanliness. Change one variable and record the result.

Espresso reasoning · Strength vs extraction · Cleaning and safe stop conditions