Hello, Richard.

The steak might be a signal of the beef you inwardly still have with her (the family dinner is "having food together" and it turns out to be beef) or with her failings - in this case her failing to provide evenly and consistently. It's still a raw and tender issue for you. I think that could mean that this dream was a way to release such feelings now that she "left house."

Cheers,
Oliver