The flowers are good, but you have to get them, while they are still fairly new.  As they age, they start to get bitter.  When I lived in the Virgin Island's some of the resturaunts in the  used them in their salads.  I have read about the N.A.'s using the thorn and string attatched as a needle and thread.  You can shave the thorn down to a smaller diameter.  
                                                                         Wayne