The word “Panang” is derived from the ancient Khmer language that was adopted by the Thai, meaning “cross” mostly referring to leg position, like sitting cross-legged (on the floor). In the old time there was a way of cooking grilled chicken by crossing the chicken’s legs and setting the chicken upright instead of halving the chicken open and cooking it on the grill. The chicken that sat cross-legs up on the grill would be bathed with a curry paste that contained ground roasted peanuts in the paste then mixed with coconut cream. It would be brushed with the same mixture over the whole cooking time on the grill. This is a dish called “Gai Panang” or chicken Panang, due to the position of the chicken on the grill.
Later on, the method had been simplified by cutting the chicken into big pieces and cooking them in the curry in the pot over the stove instead of over the grill. This is the origin of Panang curry.