Preheat a cast iron grill on the stove top on medium heat.

Remove the hen from the plastic, and rinse under cold water thoroughly.

Put the chicken breast side down, and using a very sharp knife, cut through the backbone.

Turn the chicken over so it is butterflied.

Put your fingers under the breast skin and lift it up a little. Put some soy sauce in there and pat down.

Put the chicken on the grill, breast side down. Put a heavy skillet over it to weigh it down.

Grill for 30 minutes, then turn.

Put on Hoisin sauce, cover and cook for 30 more minutes, or until the bird reads 160 degrees on an instant thermometer.

Cut in half through the breast, serve one half to each person and enjoy.