My friend and I went for Dim Sum. Technically called Yumcha when eaten with tea, it is popular in Hong Kong to eat Dim Sum for breakfast. We found an all-you-can-eat place in Ikebukuro and ate for three or four hours. Of course, they messed up the order, which is why we were able to stay so long. It was decent, although not the best and I'm not sure I'd go again. True to the Chinese reputation in Ikebukuro, we found a dead fly in one of our glasses.
But these little mouse dumplings were adorable. The warm custard inside wasn't bad either.