Krishna answers this in a particular verse-
“patram puspam phalam toyam
yo me bhaktya prayacchati
tad aham bhakty-upahrtam
asnami prayatatmanah”
He says you have to offer me love and devotion, that love and devotion, if it is not there in your heart right away, then you have to practice to create that love and devotion.
That means you have to offer with mudras, mantras, with rules and regulations and everything.
But once that love and devotion to Krishna is developed, like Mother Yashoda or other pure devotess, then Krishna can eat, not banana, but even the peel of banana or He can even give up Chappan Bhog of Duryodhana. He can eat spunach, some simple leafy vegetables, cooked or uncooked.
Because the ingredients are not what you offer, the ingredients are love and devotion, how much you offer with love and devotion, that is what He loves to have from us.