The Laboratory Phase — Upcoming Roasting Experiments at Coffee Quadratic
In the world of specialty coffee, "good enough" is a variable we don't accept. To find the absolute peak of a bean’s potential, you have to be willing to break the rules, change the constants, and record the results.
This month at the CoffeeQuadratic Lab, we are moving beyond standard profiles. We’ve designed three specific experiments to test how heat application changes the molecular structure—and ultimately the flavor—of our latest arrivals.
Experiment 1: The "Soak" Method vs. High Charge
The Hypothesis: By starting with a lower initial heat (the "soak"), we can achieve better internal bean development without scorching the exterior.
Most roasters "charge" the machine at high heat. In this experiment, we’ll be dropping our Guatemalan Huehuetenango into a cooler drum and idling the heat for 60 seconds before ramping up. We want to see if this "gentle start" leads to a more uniform color and a sweeter, more developed core.
Experiment 2: Extending the Maillard Window
The Hypothesis: Adding 45 seconds to the Maillard phase will exponentially increase the "body" of the coffee without increasing bitterness.
The Maillard reaction is where complexity is born. We’ll be taking two identical batches of our Ethiopian Yirgacheffe.
Batch A: A standard, fast-paced roast.
Batch B: A controlled deceleration of heat just before the first crack.
We’ll then blind-cup both to see if the "Quadratic curve" actually translates to a heavier mouthfeel on the scorecard.
Experiment 3: The "Fast Finish" Challenge
The Hypothesis: A rapid development time post-crack will preserve delicate floral acidity that is often lost in longer roasts.
This is the high-wire act of roasting. We’ll be pushing the heat at the very end of the roast to finish the batch within 90 seconds of the first crack starting. It’s a risk—one wrong move and the beans are "flicked"—but the reward is a cup that tastes like fresh jasmine and citrus.
Design of Experiment #1
Finally after two years of thinking about the first roasting design of experiments (DOE), the first two factor and three level DOE has been conducted. A simple design is illustrated here:
Next step is testing. The tests will including roasted whole bean agtron, ground agtron, and cupping results.
Coffee Research Pondering
Lots of progress has been made over the last few weeks on some home coffee projects. I have a few goals over the long weekend to read some coffee research articles. It would be fun to run some roasting design of experiments and publish a research article on some results.
Craft instant coffee seems to be a thing now. It might be interesting to try to make a good and alternative in a novel way. Some brainstorming ideas are in progress.
Pandemic Roasting and Baking
It all begins with an idea.
Creating this blog post to track progress on coffee roasting during the pandemic. One year later, I realize that I haven’t made as much progress as desired. I plan to use this blog to track coffee experiments and a few side baking projects.