First, please ask the landlord to see what the above method is like, and then open the package to see if the coffee inside is beans. Is it powder? And other things are still powdery objects. If it is powder, the production method only needs to brew, then the powder will remain and be thrown away. This kind of coffee should be the so-called black coffee (provided that there is no milk and no sugar), but the quality of this kind of coffee can no longer be guaranteed, because the most important thing of coffee is freshness. No matter how you treat this ground fragrance technically, it is not as good as the real ground fragrance outside. So if it is brewed with water and dissolved in water, it is a typical instant, not the so-called black coffee. If you open the package and find that it is beans, you need to buy a coffee machine to make it yourself, or take it to the coffee shop outside to help you make it, but it should not be beans.