A similar project operates at several UK prisons, overseen by The Clink Charity. Under supervision, prisoners cook and serve at a restaurant open to the public. Certainly for the trainee chefs, the project leads them towards nationally recognised qualifications and the charity then helps both trainee chefs and servers to find employment on their release.
And the food is decent enough - [Styal, Cheshire] Clink - at HMP Styal - another OK lunch