The Jews cried out in the desert זכרנו את הדגה אשר נאכל במצרים - We remember the fish that we will eat in Egypt.
What was their problem?? They had the mon which could taste like anything??! Also, what does it mean when they said נאכל - we WILL eat. Why didn't they say אשר אכלנו - that we ate [past tense]?
Explained the Ponim Yafos: Fish is an appetizer. The missed having their appetite whetted so they would eat more. That is why they said נאכל - we will eat. They missed that feeling of wanting to eat more and more.