The description here is good, but our version was slightly different. The start is often called LA TEJERIA. We followed LA GARGANTAS up to a division in the path and took the left fork up REVENTUACHULOS which cuts off a bit of the route up to the col. From there, you can reach EL LLANO DE LOS HONGOS easily and from there, up to the summit.
To return, we took the PEDRERA - the scree run down and instead of turning right back to llano de los hongos, continued down the BARRANCO DE ABEDEJO which is difficult to find, but if you know where you are heading you will find cainrns marking the route.
Eventually (you need a good map to be sure of picking the right path once you get to the base of the barranc in the trees) you will return to the outward route and back to the carpark.