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Halacha forbids eating Masa throughout the day of Ereb Pesah, in order to ensure that one has an appetite for Masa at the Seder.
The Halachic authorities addressed the question of whether this prohibition applies as well to the other foods that one must eat at the Seder. For example, does Halacha also forbid partaking of Marror on Ereb Pesah, in order to ensure that one eats Marror with an appetite at the Seder? For that matter, one might ask whether it is forbidden to eat eggs on Ereb Pesah, as it is customary to eat an egg at the Seder in commemoration of the Hagiga sacrifice that used to accompany the Korban Pesah.
The Rama (Rabbi Moshe Isserles, Poland, 1520-1572) indeed records a custom to refrain from Marror on Ereb Pesah. According to this practice, it would be forbidden to eat a salad with romaine lettuce on Ereb Pesah. The Bet Yosef (commentary to the Tur by Maran, author of the Shulhan Aruch) also records this custom, and writes explicitly that this is not the practice of the Sepharadim. Therefore, Sepharadim may eat romaine lettuce on Ereb Pesah without any concern.
As for eating eggs on Ereb Pesah, Hacham Ovadia Yosef writes that there is no reason at all to refrain from eggs on Ereb Pesah, even according to the custom of the Ashkenazim. Eating eggs at the Seder is, at best, just a custom, and not a strict Halachic obligation. As such, Halacha certainly does not impose a prohibition against eating eggs on Ereb Pesah to ensure an appetite for eggs at the Seder. Hacham Ovadia even adds that if a person had been accustomed to refraining from eggs on Ereb Pesah, he may discontinue this practice without Hatarat Nedarim (the formal annulment of his vow), since this custom qualifies as a "Minhag Ta’ut" – a custom accepted on erroneous presumptions.
In any event, even those who refrain from eating romaine lettuce on Ereb Pesah may certainly eat eggs on Ereb Pesah.
Summary: It is forbidden to eat Masa on Ereb Pesah. Sepharadim may eat romaine lettuce on Ereb Pesah, while some Ashkenazim have the custom not to eat romaine lettuce on Ereb Pesach. Eggs may be eaten on Ereb Pesah according to all opinions and customs.
