The last sip is delicious!
Since I didn't want to wash a spoon, I was drinking coffee like this, and before I knew it I had started taking my coffee like this all the time. The last sip is great!
Don't stir with a spoon. When you only have one more sip left, shake the cup to melt the brown sugar, and then you can drink the cup clean.
Enjoy Japanese food around the world.