It's the same as in Portilla del Crampón Normal,
but when the gully to the Portilla gets narrow you have to go to the right, towards the obvious and rocky E spur.
The Canal Este or E gully is the well marked corridor placed between the E spur (and the E pillar) and the visible big diedre (vía del diedro) of the NE face. This is an easy route that leds firstly to the gap over the left buttress, wich forms the big diedre. Then, the gully joins with the N face one and continue strightly to the top along the evident trail.
Although the grade and the slope gradient are not high, I'd advice you about the difficulty of this route. So it's recommendable to use rope/s, cams, friends and 4 ice screws in Winter or early Spring. Also bring warm clothes, map, compass and altimeter (at least in Winter). In the late Summer take some water with you.
First Descent Skiing
It was in 1986. Grade I