Um...exactly WHAT is being carved here at Tacos del Toro?

This is part of the wall mural at Tacos del Toro on Laurel Canyon at Oxnard in Valley Village.  The mural has cartoon pigs being put in cooking pots, tacos being made, etc.  But exactly what is going on in this section of the mural? And specifically what cuts of meat are being used in the tacos?