What+type+of+foods+do+angels+eat?

In the story "The Very Old Man With Enormous Wings", Gabriel Garcia Marquez describes how people threw food at the angel like for example mothballs and papal lunches, but he refused them and only ate eggplant mush. The people didn't know eat, so they threw mothballs because the wise neighbour woman told them but the angel didn't eat them. The people didn't know what he ate and they thought that probably because he was an angel or an old man he only ended up accepting only the eggplant mush.