My cup of tea

Where does the idiom _ is my cup of tea come from? What is the orgin of this phrase? Any information about this saying would be most appreciated!

"It's not my cup of tea -- I don't like it. It's not to my taste...The saying is of British origin and was used in the affirmative sense in the mid-eighteenth century. The negative form has been current since the 1920s." Random House Dictionary of Popular Proverbs and Sayings by Gregory Y. Titelman (Random House, New York, 1996). Page 187.

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