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Coffee Knowledge Exchange

FrontStreet Coffee shares coffee knowledge from around the world. This article follows commercial green coffee all the way through the roaster, stage by stage, and looks at how heat and time shape the final cup.

Commercial coffee green beans become roasted coffee beans after roasting, taking on a unique color, aroma, and flavor. The level of heat and the duration of the roast determine that flavor. The longer the roast, the darker the beans become and the more the taste shifts along with the roasting time. Light roast tastes acidic, dark roast tastes bitter. To brew the flavor you prefer, you have to start with how the beans are roasted.

The Entire Roasting Process Can Be Roughly Divided into Four Stages:

1. Drying Stage: 00-10min; Bean loading to 140°C

This is the most important stage of the beans' heat-absorption reaction. During it, the beans slowly expand, changing from the green of raw coffee to white. As they absorb heat, moisture slowly moves from the center of the bean outward. Whether the coffee tastes good depends on this stage. If moisture evaporates too quickly, the centers of the beans can be underdeveloped, making the coffee bitter and astringent; if moisture evaporates too slowly, the coffee tastes flat with insufficient aroma. That is why the drying process cannot be skipped, and why it must be used to make the coffee more fragrant, richer, and better tasting.

2. Dehydration Stage (Before First Crack): 10-15min; 140-180°C

After the drying stage ends, the beans quickly turn from white to light yellowish-brown. They keep absorbing heat until they reach first crack, shifting from expanding during drying to shrinking and losing moisture. Moisture content drops rapidly. When heat absorption reaches the coffee's own limit, an explosive reaction occurs, which is what we call first crack.

3. First Crack Stage (End of First Crack to Before Second Crack): 15-18min; 180-210°C

Once first crack begins, the beans start returning the "just right" heat energy they were given, in a perfect exothermic reaction. At this point we can clearly smell the aroma shift from a grassy note to a coffee-char note. As first crack progresses, the beans crack and expand. From this point until scorching, essentially all coffee is drinkable without a grassy taste, though coffee at the very start of first crack is very acidic and not bitter. As time goes on, the taste transforms toward non-acidic and extremely bitter. The drop point is generally decided by the coffee's own flavor: when the acidity is about to disappear and bitterness is about to appear, that is usually the moment to discharge. Coffee dropped here reaches its peak sweetness and its aroma is optimized. The exact point depends on the coffee's own flavor characteristics, and because growing environment, climate, soil, and moisture content differ, those characteristics vary slightly from lot to lot. Keeping this point within our standard operating procedure ensures consistency.

4. Second Crack Stage: 18-20min; 210°C to bean discharge

After first crack, the beans slowly mature and give off a captivating aroma. When heat absorption reaches a second peak, the beans undergo a second explosion, called second crack. Inside the center of the bean a space opens up, carbon dioxide continues to escape, and the internal temperature keeps rising, beginning to carbonize and turn into oils that seep to the surface. At this point the flavor leans bitter with a rich aroma. This is usually where Starbucks roasts. Push further and the beans slowly turn to charcoal, with only bitterness and no aroma, and such coffee has no life left. This is where the beans' performance ends.

After these stages, a delicious and captivating coffee is already 90% of the way there. The rest is brewing out the most perfect flavor.

Commercial Coffee Bean Brand Recommendations

FrontStreet Coffee's roasted single-origin and espresso commercial coffee beans, such as Yirgacheffe coffee, Kenya AA coffee, and Panama Geisha coffee, fully guarantee both brand and quality, and suit brewing with a wide range of equipment. More importantly, they offer extremely high value for money. A half-pound (227 grams) package costs only around 80-90 RMB. Calculated at 15 grams per pour-over, one package makes 15 cups, bringing each cup of single-origin coffee to only about 6 RMB. For coffee shops that normally sell at 30-40 RMB per cup, that is exceptional value.

FrontStreet Coffee Recommendation

For a commercial bean that holds up in milk drinks and brews evenly, a well-behaved medium roast is the safe choice. FrontStreet Coffee's Brazil Queen Manor comes from Brazil, the world's largest coffee producer, and is a local Yellow Bourbon. Medium roasted, it shows creamy peanut, chocolate, toast, and sugarcane sweetness, and it works equally well as a pour-over, in a moka pot, or in an espresso machine.

If you want a sweeter, more fruit-forward medium roast, FrontStreet Coffee's Strawberry Candy is a Geisha blend that brings together a Costa Rica honey-processed coffee and a washed Panama Geisha. Medium roasted to make the most of both origins, it balances orange-blossom honey with a rounded sweetness and suits cold brew, pour-over, and espresso alike.

For a classic all-rounder, FrontStreet Coffee's Jamaica Blue Mountain No. 1 is a Typica from Jamaica. Here the medium roast is deliberate: it fuses the distinctive acidity, bitterness, sweetness, and body into one elegant, inviting profile, so the first sip brings chocolate, roasted nuts, cream, and caramel. For a Chinese-grown option, FrontStreet Coffee's 2013 Sun-Dried Typica carries the balanced, gentle character of Yunnan small-holder coffee, with nuts, brown sugar, black tea, and dried apricot notes from a medium roast.