Was looking for Blueberry recipe and seen @dirtsailor2003 recipe for Upside Down Blueberry Polenta Cake. Was between this and @chilerelleno Blueberry Baked Oatmeal. John made comment that that Blueberry cake was his favorite so that what I went with though I will be doing that oatmeal one. Could not decide between orange or lemon rind so I did both. I think that was the right call as can taste both and it is really good. I forgot to grease the sides of pan but no big deal just ran a knife around and not to bad.