Six-week muffin batter?

We used to have recipe for muffin batter that kept in the fridge for up to six weeks. It included ermilk, oranges (& maybe orange peel?), raisins (or craisins), and bran. I think there may actually have been two kinds of bran in it, definitely the kind you eat as brekfast cereal but also some other bran you add hot water to before using it in the recipe. Have looked and looked and looked, can't find the recipe anywhere!!!