Letter from Śrīla Prabhupāda:
I have duly received the bananas you sent, and you can send me these dried bananas tons and tons. It is very useful and can be nicely used for our Ekadashi foodstuffs. After drying the bananas you can make powder, just like flour, and out of this you can prepare puris, halava, pakoras and other fruit products.
(ACBSP. Letter to Govinda. 27th October 1969. Tittenhurst, John Lennon's place.)