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Banana flour is simply flour made from green bananas. Green bananas have not ripened, so they have less sugar content, and banana flour also contains a great amount of resistant starch, which makes it an excellent pre-biotic, which means it promotes healthy bacteria in our gut. Check out https://bananaflour.com/resistant-starch-rs2/ for more info.
While this recipe does not contain apple cider vinegar, I have enjoyed banana flour waffles that incorporated apple cider vinegar as one of the ingredients. The apple cider vinegar is a leavening and flavor enhancing agent. Just google Banana flour recipes to see many ways of using this amazing and tasty flour.