Roasted duck carcass - what is this dish called?
I found this recipe on 
supertoinette .

The name of the dish is "Carcasses de canards grillées" which translates to roasted duck carcasses. It states below the name that "These carcasses of roasted ducks are a specialty of the Southwest!"

If you use Google, you can translate the page and get the recipe and instructions. This particular recipe uses ingredients in addition to the salt but, as with most recipes, I would expect that there are many variations.