to cook a rock duck you need to heat two medium rocks about the size of a hard ball. build a hole about one foot deep and start a fire with apple wood, burn down to a nice bed of coals. super heat your two rocks. put onions and a few garlic cloves and three apple slices and the two hot rocks inside the duck and rap in tinfoil. put in hole then cover with dirt. Leave this for about three hours. Take duck out of hole and unrap. Take the rocks out, throw the rock duck away and eat the rocks , because every one know a rock duck is a merganser and not worth eating anyhow and since you went to the trouble of trying to cook the stupid thing and you read this thread you might as well eat the rocks. Hay a little humor ai'nt all bad