Albert Barnes Commentary Esther 5:6

"And the king said unto Esther at the banquet of wine, What is thy petition? and it shall be granted thee: and what is thy request? even to the half of the kingdom it shall be performed." — Esther 5:6 (ASV)

The banquet of wine: After the main courses were removed, it was customary in Persia to continue the banquet for a considerable time with fruits and wine. During this part of the feast, the king renewed his offer.