Which has a unique sour and mellow taste

Manning's suffering will not upset you, but will make you feel more awake. Before you encounter real pain, Manning is just an ordinary drink with a bitter taste, a refreshing liquid, a tool to slow you down, and it can't feel your grievance yet. but there are many people who are madly infatuated with Mantenin's bitterness, as if they can't quit if they are poisoned. If you want to know why, they will smile and tell you: "because love is bitter." Manning style Manning leaping micro acid mixed with the richest aroma, so that you can easily taste the lively factor in the mild fragrance, its outstanding taste confuses many suitors, the baking degree of beans is too shallow, it may be that the baker's preference for acidity is more than you can bear, or the baking itself has failed.

2. Coffee beans have been kept for too long. They have been kept for a long time before they are sold or long after you buy them back. The expired beans will show signs of sour.

3. The degree of grinding is too coarse, which results in insufficient extraction and sour taste in the process of making coffee.

4. The water temperature is too low (but you say it is American, American coffee machine generally does not have the phenomenon of too low water temperature)

5. Let the coffee cool after making it, and the cold coffee will highlight the sour taste of the coffee