1, banana peel blackening is actually a normal phenomenon. Bananas were blue when they were first picked. Bananas themselves will release ripening ingredients and slowly mature. Many tropical fruits, such as jackfruit and durian, are like this. Some people put bananas and immature apples together to make apples mature, and the mature banana peel will slowly oxidize and other reactions will lead to blackening.
2. The reason why the emperor's banana is a little bitter is that it is not ripe enough. If the banana is not ripe, it will taste a little bitter or astringent.