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Patsy's Pies is a diner owned by Margo Mierzejewski and managed by Fiona Gallagher, formerly managed by Sean Pierce. It is a frequent location used for Season 5 and up. 

Season Five

Sean manages the diner and gives Fiona a job there as a waitress after she is released from prison and is struggling to find a job. As a recovering heroin addict, Sean hires many ex-convicts at the diner. Sean and Fiona also grant dishwashing jobs at Patsy's to Ian, Lip, and Carl throughout the series.