Important processes for coffee extraction: steaming and pre-soaking

Pay close attention to the coffee comment (Weixin Official Accounts vdailycom ) and find that the good coffee shop opens its own shop, steams and pre-steaks are single-item hand-brewed coffee and esp in the first stage of extraction. Whether steams and pre-steaks are sufficient directly affects the taste of a cup of coffee. Although the two are applied to two kinds of coffee with different production processes, they have a very close relationship and interlinked principles.