All these years I've been slicing the whole banana on my cereal even though I wanted only half, because there seemed to be no way to save the other half without having it go brown and yucky.
This morning I stuck the other half face down in an inch of water in a small glass, and at dinner time it was looking good. Now let's see if it makes it through the night. I would have tried acidulated water, but I didn't have a lemon handy.
If it doesn't work, I'll be open to suggestions. And no, I won't put it in the re-frig-er-a-tor, cha-cha-cha-cha.