Berachah on walnuts, bananas, etc.

Hi,

Ideally, one should recite berachot (blessings) on whole foods rather than partial foods, as a way to beautify the berachah. However, one who has a fruit that is inside a shell or peel, and who suspects that the fruit might be wormy, moldy, or otherwise inedible, should first open the fruit and check inside, and only afterward recite the berachah.

(Rivivot Ephraim 1:151:3)

Have a great day,
Mordechai