The only way this would be feasible is if you had a rotating schedule, like a school cafeteria. But just like a school cafeteria, you'll never make an economic profit because a portion of your customer base will be disinterested on every day. It would wind up being subsidized, which means the costs (quality) will be under constant pressure by management.
Even if you solve the choice and quality problem, I'm not buying from work unless it's also cheaper than a similar product I can pick up on the way home or have delivered. Convenience only carries you so far. If it's a hot meal, takeout/delivery will be hotter and fresher by the time I get home. If it's prepared/ready to heat, then there's a bunch of meal kit delivery services that do similar things; even supermarkets have meal kits now.
A general rule of business is not to expand into products that aren't directly tied to your core business, areas where you don't have synergy or a competitive advantage. So unless you are a business that prepares food, you probably shouldn't be getting into that business either. The only reason to try is to provide a needed benefit to your employees, and I don't see how a random employer would do better than all the other options out there.
