This is the recipe I usePapas Arrugadas Recipe - DiscoverLanzarote.com
There is a state owned museum of local history, near the roundabout by the monument de campesinos, it has a restaurant that only serves traditional Lanzarote food. They do suckling pig roast in salt.
The picture with the link says it all!
These are always on the menu when we have Bakers Cornell grilled chicken and a bottle or two of beer.
I ended up cooking in smaller batches so I had about 6-9 small yellow potatoes and put in about a 1/4c of sea salt. I used Morton brand. Then scrubbed the potatoes and put them in the cold water(about 8 cups maybe) and poured the salt in and put it on high heat for about 45 mins
:-D They were better room temp/chilly to me and the kids