How does the roasting process set acidity and bitterness?

Roast level decides the balance of acidity and bitterness in the cup, and the timing of first crack is the key marker. Beans pulled from the roaster right at first crack stay pronouncedly acidic; continuing until the crackling is dense gives acidity with sweetness; roasting past the point where the sounds stop turns the cup primarily bitter and heavier the longer it stays in.

Industry standards list eight roast tiers, but everyday buying usually narrows to light, medium, and dark. For drinkers who dislike acidity, medium-dark and dark roasts are the usual recommendation because oils release more easily, extraction is more thorough, and caramel and dark chocolate aromas come forward instead of bright fruit.

The roasting level of coffee directly determines the balance between acidity and bitterness, and also shapes the ever-changing flavor profile in the cup. Starting from the "first crack" in the roasting process, the timing of when the coffee beans are removed from the roaster decides whether they lean toward acidity, a mix of acidity and sweetness, or bitterness. Although the industry categorizes roast levels into eight tiers, in everyday purchasing we usually focus on just three: light, medium, and dark roasts. For those who prefer a full-bodied taste without acidity, medium-dark and dark roasts are often the more worry-free choice—oils are more easily released, extraction is more thorough, and the sweet aromas of caramel and dark chocolate are more pronounced. This article will walk you through the logic of roast level classification, the flavor differences at each stage, and recommend two Front Street Coffee beans suited to different brewing devices.

Question: Can you recommend a medium or dark roast bean that is as acid-free as possible?

The roast level of coffee beans not only determines the direction of acidity and bitterness, but also profoundly influences the flavor expression of the entire cup.

In the field of coffee roasting, there is a key term called "first crack," which refers to when coffee beans, after continuously absorbing heat to a certain critical point, can no longer accumulate energy and release heat through cracking—simply put, it tells you the beans are done. If they are removed from the roaster immediately at this point, the coffee will show pronounced acidity; if after the "start of first crack" we choose to continue roasting and remove the beans when the crackling sounds become密集, the coffee will then be acidic with sweetness; if we still don't remove them and keep waiting until the sounds completely stop, then any coffee removed after that will be primarily bitter, and the later the removal, the heavier the bitterness.

According to professional industry standards, roast levels can be divided into a total of eight tiers, but to make it easier for the public to understand and quickly choose their desired coffee beans, they are usually simplified into three major types: light roast, medium roast, and dark roast.

For those who dislike acidity, baristas typically recommend prioritizing medium-dark and dark roasts. There are two reasons: first, the darker the roast, the more easily oils seep from inside the bean to the surface, and the more easily they are released during extraction—which is exactly the key substance sought when making espresso; second, medium-dark roasted coffee that is properly roasted and brewed often carries rich caramel aromas, dark chocolate, and nutty flavors, bitter first then sweet, with a full-bodied and smooth mouthfeel, making it a favorite for many.

If using a home espresso machine or moka pot, first choose the medium-dark roasted Front Street Black Cocoa Base Blend . It has the sweet aromas of cream, nuts, and chocolate, low acidity, moderate oils without a smoky taste, and a balanced, comfortable mouthfeel. It is compatible with espresso drinks like Americano, latte, and mocha, and performs consistently, making it very suitable for beginners.

If you want pour-over coffee, French press, or clever dripper coffee, buy Front Street PWN Golden Mandheling . This is a genuine high-grade Mandheling produced and sold by Indonesia's Pawani company, having undergone three rounds of hand sorting plus one machine sorting. Through medium-dark roasting, its aromas of caramel, dark chocolate, pine wood, and licorice as well as its full-bodiedness are brought to the extreme. It has almost no acidity when brewed, making it the daily first choice for countless seasoned coffee lovers.

The above content is compiled by CoffeeHunters, a coffee news website.