NO!! It is not a fruit!!!
A is performed by sticking one's tongue out (so that the tongue is touching the lips on all sides) and blowing to achieve a "farting" noise. Like this:
Occasionallly when performing a raspberry, saliva is propelled unintentionallly from the mouth. Sometimes this gives added effect, however, usually a brief, discreet and humble apology is in order. If this is the case you must then proceed to right the situation by executing a proper raspberry at the victim.
Who to Raspberry?