im on the same page with Elrohwen and peppy.. Yeti gets a week of romaine (i try to mix in mint but he hates it) picky bugger. then i switch over to a spring mix. with spinach. and thats all Yeti will eat. he wont even look at carrots which i find odd. he enjoys celery but i dont usually keep that in my fridge.. he cant get through a stalk without it going limp and i refuse to eat it. so if i can find small stalks of celery ill grab them otherwise he can live without.
Yeti doesnt seem to have a problem with the week on week off routine he's on. i think your bun(s?) shouldnt have a problem.