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I've actually heard butter+coffee few times in a week couple of years ago.

FIRST1902
On International Coffee Day, Introducing Butter Coffee - 今天国际咖啡日,介绍牛油咖啡

Oh, I will join you! I use the Kerry Gold in it. By the way, it is Irish Butter, but you can get it almost anywhere.

It's not easy to get that in Singapore. There was a place I knew have it but recently, I don't see it there. :-( sad.