I went to Toraya Cafe in Omotesando Hills. I had the Sweet Red Been Buns (Anpan)! There are two types of bean paste, tsubuan (whole azuki paste) and koshian (pureed azuki paste). I tried both of them and they were amazing! You can also buy the azuki bean paste as a souvenir. I recommend putting the paste on bread!  Anpan 184yen.