Understanding and testing variables is an essential part to coffee brewing. Without following some type of organized method it is pretty hard to move forward in your brewing journey. Journaling and/or documenting your brewing can be done in numerous ways … just do it!
Whether you’re brewing on your V60, pulling shots on your Strada MP, or extracting on your trifecta you can apply the same general rules to tracking your work. First step is to identify and list your brewing variables – time, turbulence, dose, temperature, etc. After listing them you can then figure out how you want to track them. Graph paper, spreadsheets and Moleskines are all great for recording your data. I’m a nerd so I prefer spreadsheets. Proof follows below...
Write everything down as you do it and create your first brew. When it is completed write down notes about the resulting cup. I use the same rules as you would for cupping – aroma, mouthfeel, acidity, flavor notes, finish, etc.
Now comes the hard part: after tasting your brew choose one thing to change. This is definitely the most challenging for me because I always want to make three or four changes at once. However, I’ve come to learn that if I change more than one thing I may not be able to link the resulting change to the correct variable. (Remember middle school science class and learning the Scientific Method?) Make the change in whatever variable you’ve chosen and, keeping all else the same, brew again.
Repeat this process of brewing, tasting, notating and variable changing until you are satisfied with your brew. Your record on paper or in some digital form will allow you to go back and reference how different variables affect different aspects of brewing. Over time you’ll be able to even identify patterns that may apply to coffee variations such as origin, process and density.
My own collection of spreadsheets has proved invaluable for me when I have a new coffee to approach. I can most always find a similar coffee to use as a starting point for something I’ve never tried before.