For me, whatever it is black coffee or milk coffee that is added with milk and sugar, it is commonly seen. However, can you imagine add salt into coffee? What does the coffee taste? I think that it is quite mad to do. But you may not know that the origin of salt coffee is a romantic love story.
An ordinary boy comes across an outstanding girl one night at a party and falls in love with her. He decides to invite her to enjoy a cup of coffee together after the party is over. Acutally the girl is not willing to date with him, but she accepts it for politeness. When they sit down at the coffee shop, the boy is too nervous to say a word, it makes the atmosphere intense.
At that time, a server sends a coffee for him, the boy asks for salt and add to the coffee. The girl is quite curious and ask why. He says that the salt coffee reminds him of his hometown, his childhood and family. He lived along seaside when he was a child, but he seldom went back to his home. He misses his home and family hard.
Surprisingly, the girl is deeply touched by his story. She thinks that the boy has the sense of taking responsibility because he loves his family so much. So the girl talks with him about her childhood, her family and her hometown. Finally, they get married and lead a happy life. The girl orders salt for the boy anytime they go to coffee shop. The boy drinks salty coffee for a lifetime.
He died 40 years later. She eventually knows the truth after that: the boy actually does not like the salty coffee. But the girl does not feel anry with him, because she still love him. Salty coffee is a mistake, because he felt so nervous at that time, he mistakenly said salt rather sugar. But he didn't tell her the truth because he was afraid of losing her. So he started to enjoy salty coffee gradually.
This a romantic love story of salty coffee, one way valve you can always have a try if you feel interested in it.
One way valve believes that drinking coffee should be like tasting wine, first smell the aroma, and then try a small bite, that you can taste the essence of it.