Melva was relieved to visit the building where the ghouls were currently preparing their food as ordered by Alden. The ghouls there did not have much experience going up and had spent most of their time underground. They had no idea how humans enjoy their food.
The building had a 'Food Storage' banner hanging on the front of it, which was exactly what it was. There were countless storage rooms where they stored chunks of well-preserved human flesh that had been cut into equal size, ready to be handed out to the ghouls as their rations. They ate their human flesh raw and they thought humans also ate their food raw, too. Melva and the others almost ate raw fish for dinner.
Rosetta might go as far as to use the forbidden black magic to curse the ghouls here out of anger if she found out they tried to feed her raw fish.