If you cant get a banana Tengu just try popping it in a sealed brown paper pag on a warm sunny window sor a day or two. Should soften it up.
So saying easier to process when hard and if you pop it in the oven, or the chutney making process, both will caremalise the sugars and soften it up. A little firmness in chutney can be nice.
Sent via smoke-signal from a woodland in Scotland.