I try to cook with what's in season and what's on special at my butcher.
Some things we only have once a month or less if the ingredients are season but other things we have quite often. We have lamb curry about once a fortnight because we all like it so much - I have one going in the SC right now.

My MIL cooks the same meal 19 times out of 20!!!! It is rice, salad and a sauce with meat, ginger, onion, tomatoe paste and garlic. Even on the rare occasions that FIL cooks something else she still dishes out meal A with it.
She serves it up for lunch as well as dinner!!!!
I don't know how my FIL copes. My Dad started to complain after eating 3 meals there lol.