Before coffee roasting, coffee should be treated by natural method or water washing method before it can be roasted. First, bake it in a big drum. After 5 to 7 minutes of high temperature, the water in coffee beans gradually volatilizes. At this time, the coffee beans begin to turn yellow and produce a strong fragrance. Eight minutes later, the "first outbreak" began, and the volume of coffee beans doubled, making a crackling sound. At this time, their color is light brown. After baking 10 to 1 1 min in the container, the color of coffee beans becomes darker and darker. When baking for 1 1 or 15 minutes (depending on the type of coffee), all the flavors of coffee beans are released, and most of these flavors can reach a balance. At this time, the "second explosion" began, which marked the end of the coffee bean baking process. Transfer the coffee beans to a cooling plate.
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Coffee is a fresh drink, and its enemies are oxygen, light, heat and humidity. In order to ensure the freshness of coffee, coffee should be stored in a light-proof sealed container at room temperature. Fresh coffee should not be kept for more than a week.