The employer is allowed to ply the workers with wine so they will not be inclined to eat many grapes. The workers are allowed to dip their bread in brine so that they will be inclined to eat more grapes. However, the workers are not allowed to eat anything along with the grapes to increase their appetite.
Can the workers prepare their food in a more delectable way, such as toasting the grains or grapes on fire? This differs from preparing themselves to eat more and adding something else to the food. The last question remains unresolved at this time.
Art: Harvest At Eragny by Camille Pissarro