A portable, multipurpose cooking utensil includes a base pan adapted to retain a grill having a dome-shaped, transparent lid thereon. A one-tap adaptive filter generates a control signal Scp by multiplying the adjustment reference signal Sra by a filter factor W. At least one of the opposed edges overhangs an undercut region of the micromachined crystalline structure by an overhang distance that is greater than one third of the width. The distinctive metadata is presented or played in connection with the message for purposes of readily identifying the authentication.