Runwell-Steve said:
Not sure quite how I would go about adding bananas, I doubt they would appreciate being boiled. Experiment time.
I thought the same thing about boiling them.
Instead I thought that a banana while within its protective skin would be pretty clean. I therefore peeled them carefully into a clean freezer bag, froze them, thawed them, mushed them up in the bag by squashing the bag in my hands and then opened and poured into FV. Unless something else went wrong unnoticed, I guess the infection was caused by bacteria already on the bananas. I've not tried again since.
Perhaps after mushing up, a short time sat in an oven at say 80 degrees would kill any bacteria without destroying the banana flavour?