"to you" is dative. However, if "bananas" is subject and plural, why isn't the verb plural? Is it possible that "pleasing" is subject with a singular verb in agreement and that "bananas" is (sorry for the Latin grammar) epexegetic to the supposed "it" of the verb? Please note that I'm guessing here - any Hindi gramarians lurking about? Note that Marcin85 does not answer the question that was asked concerning the number (sing/pl) of the verb. This is also my question.
This is an edit: I notice that other similar sentences use the plural form of the verb; I suspect that the singular use in this sentence is simply a typo. (But I did have fun trying to concoct the new observation above. Mea culpa.)
It does, someone speaking Hindi would probably still understand you but they would know that you do not speak well. Just as if someone told you that, "You like banana." instead of "You like bananas." The "s" matters to us because it pluralizes and completes the English sentence.