combine flour, cocoa, and baking soda. Mix well. In large bowl, beat the sugars and butter until light and fluffy. Add vanilla and eggs; beat well. Add flour mixture; blend well. Stir in 1/2 cup of pecans. For each cookkie, with floured hands, shape about 1 Tb of dough around a Rolo, covering completely. In small bowl, combine rest of pecans and 1 Tb sugar. Press one side of each ball in pecan/sugar mixture. Place nut side up on ungreased cookie sheet, 2 inches apart. Bake 7 - 10 minutes or until set and slightly cracked. Cool on cookie sheet 2 minutes, then remove and cool completely on wire racks.