Mocha (“ch” as in “choose”) is the Bengali name for the banana blossom or flower. A ghonto is a type of preparation in which veg (usually) is cooked down. Mocha is a bit of a pain to prep at home so it’s not something you’ll see cooked these days in non-traditional homes; it was rarely cooked in our home growing up as my mother worked. Anyway, the version at Oh Calcutta is rather nice.