Preheat oven to 350ºF.

Place egg whites and salt in large mixing bowl. Beat with an electric beater or by hand with a wire whisk until they form soft peaks.

Gradually add the sugar so the peaks stiffen.

Sift cocoa over peaks and fold in with walnuts.

Spoon mounds about 1 in diameter and about 1 apart onto a parchment-lined baking sheet.

Bake 20 minutes or until dry to the touch. Let cool completely before removing from baking sheet.