תלמוד על ביצה 34:8

“³⁰Tosephta 2:4, Babli 17b. It was stated: Rebbi Simeon ben Eleazar said, the House of Shammai and the House of Hillel agree that there are two dishes. Where do they disagree? About the fish and the egg on it³¹Cf. Note 3., where the House of Shammai are saying it is one dish while the House of Hillel are saying they are two dishes. Everybody agrees that if he applied the egg on salted fish³²A boiled egg is used to fill a salted herring. This is easily recognized as two dishes.
The expression פרפר is that of the corrector, following Babli and the Tosephta. It is no longer recognizable what was the original word written by the scribe., or cut leeks under the fish, or cooked two kinds in a pot, that they are counted as two dishes.” And practice follows the student³³In the Babli 17b practice is decided as following the Mishnah according to the House of Hillel, i. e., that only one dish is needed for eruv. Since the anonymous Mishnah is supposed to be Rebbi Meïr’s, and R. Simeon ben Eleazar everywhere appears as student of Rebbi Meïr (and colleague of Rebbi), the Yerushalmi decides that practice follows the Tosephta against the Mishnah..