Related על ביצה 34:11

R. Shimon ben Elazar said: The house of Shammai agrees with the house of Hillel that there are two cooking dishes. What do you disagree about? About the fish and the egg on it; there the house of Shammai says: There are two cooking dishes, but the house of le Hillel says: It is one cooking dish. Further they agree that if he boiled two sorts in a cauldron or a crumbled egg on fish or if he cut leeks under the fish, for these are two cooking dishes.