Cream together the butter, white sugar, and light brown sugar until smooth. Beat in the eggs one at a time, then stir in the vanilla. Dissolve baking soda in hot water. Add to batter along with salt. Stir in flour, semi-sweet chocolate chunks, and pecan pieces.
Work up the dough until all combined together, make into 3 logs of dough, Refrigerate in wax paper, or gallon size zipper bags overnight. The next day, take out, and cut into slices and lay onto prepared nonstick baking sheet.
Bake for about 10 minutes(do not overbake, take out of oven when golden brown and let them stay on baking sheet until firm, remove from baking sheet onto cooled cookie rack or plate.