It sounds like your Sunday dinner is a trigger.
Fubarcdn had a great suggestion, if your funds permit, make a new habit of treating yourself to a meal somewhere.
If your funds don't permit, invite a friend/relative over for dinner to keep you company.
Perhaps volunteer at a Food Bank to put your craving in perspective.
I never realized how much triggers affected me until I cut them out of my life - not drinking has never been easier in all the times I've tried to quit before.