"My coffee is sour."
"I don't like sour coffee."
Probably two of the most common comments any specialty coffee roaster treading the lighter roast spectrum would hear. What is the deal with sour coffee and why do so many coffee shops continue to serve them despite resistance from customers?
Let us first explore what causes sour flavours in coffee. As you might know, coffee contains a good amount of acids. Although still mostly a mystery, there are well-documented information about a few of the acids found in coffee beverages. The following are some of the acids recorded:
Citric Acid: The same acid found in citrus fruits like lemons and oranges. Makes up a significant percentage of a coffee's total acid content and the final perceived acidity.
Malic Acid: Mainly found in fruits like...