Coarse sugar for rolling in the cookie dough in, such as turbinado sugar. Sift together flour, soda, cocoa and salt and set aside. Cream together butter, sugars and peppers. Add egg and vanilla and mix well. Scrape down sides. Add sifted ingredients and blend only until the flour disappears. Form the dough into a log and roll in coarse sugar. Wrap in plastic and refrigerate for about one hour. Preheat oven to 350°F and line a cookie sheet with parchment. Slice log into ¼” slices and place them on the sheet about ½” apart and bake for 12-14 minutes. Tip: when the cookies are done, they will puff a little and show tiny cracks on top.