When releasing a lunch, maybe have a feature to give it to someone. Then they need to accept the lunch within 15/30 min or it will be free for all. So I don't need to refresh the page when getting a lunch from someone on Slack chat.

Or maybe enabler 'grabbers' to queue for lunch, so you can queue in the morning and if a lunch is freed, you are assigned it automatically, first come first served in the queue.