Nine North Carolina prisoners were charged with making wine behind bars.

The inmates were discovered making wine last month in the Robeson County Jail, The Fayetteville Observer reported Wednesday.

The inmates used food from their meal trays, especially sweet items, to make the wine in a plastic bag, according to Assistant jailer Capt. Jeffrey Martin.

Officials say wine frequently is found in cells, and orange juice is a key item in making it. They're considering eliminating orange juice from the jail's menu.