How are coffee samples prepared for grading?

The preparation of coffee samples for grading is a highly ritualized process designed to eliminate as many variables as possible. The goal is to create a 'level playing field' where the coffee's true character can be evaluated without the interference of brewing equipment or technique. This is why the cupping protocol is so strictly defined, from the roast level to the water temperature and the grind size.

First, the green coffee is roasted to a specific color, usually a light-to-medium roast, to ensure that the roast itself doesn't mask the coffee's inherent flavors. Once roasted, the beans are allowed to rest for a set period to degas. When it is time to cup, the beans are ground to a precise particle size—usually slightly coarser than what you would use for a drip coffee maker. This grind size is critical, as it affects the extraction rate and the clarity of the flavor notes.

Next, the ground coffee is placed in standardized cupping vessels and hot water is added. The grader will then 'break the crust'—a layer of grounds that forms on the surface—to release the coffee's aroma. After a few minutes, the grounds are skimmed off, and the coffee is ready to be tasted. The grader will use a spoon to slurp the coffee, which aerates it and spreads it across the palate, allowing them to evaluate the acidity, body, sweetness, and flavor notes.

This entire process is a testament to the industry's commitment to quality. By standardizing the preparation, graders can compare coffees from different origins, varieties, and processes on an equal footing. It is a rigorous, scientific approach that ensures the quality assessment is as objective as possible. For the reader, this means that when you see a coffee with a high cupping score, it is the result of a process that has been carefully designed to reveal the true, unadulterated quality of the beans.