When soymilk is slowly heated, the thin skin that's pulled up from the surface is called yuba (tofu skin), which is mainly used as an ingredient in soup dishes and eaten as it is with soy sauce, as one would eat raw fish.
豆乳をじっくり加熱した時に、表面にできる薄皮を引き上げたものをゆば（湯葉・湯波）といい、おもに吸い物の具として使われたり、刺身と同様にそのまま醤油などをつけて食べたりする。