This is the 11590th most frequent Russian word.
еде
"Eде" means "food" or "meal" in English (dative case of "еда").
Here, 'еде' is the prepositional case of the noun 'еда' (food), used after the preposition 'о' (about).
Я думаю о еде.
I am thinking about food.
In this sentence, 'еде' again appears in the prepositional case, used after the preposition 'о' to denote the topic of the book.
Он пишет книгу о вкусной еде.
He is writing a book about delicious food.
Once more, 'еде' is used in the prepositional case following 'о', describing the kind of food being discussed.