Can you eat behind bar while serving?

It's not clear what you mean by "behind bar while serving." Could you please clarify your question?

Here are some possible interpretations and answers:

* Are you asking about bartenders eating while working? Generally, it's not considered acceptable for bartenders to eat while serving customers. They should prioritize serving customers and maintaining a clean and professional environment.

* Are you asking about eating in a restaurant with a bar? In most restaurants, you can eat in the bar area if there are seats available. However, some restaurants may have specific seating arrangements, so it's always best to check with a staff member.

* Are you asking about a prisoner eating while serving a sentence? Prisoners may have limited access to food depending on their sentence and the regulations of the prison.

Please provide more details about your question so I can give you a more specific answer.