Preheat over to 350F. Butter and flour 9x13 pan. Sift flour with salt into bowl. Using electric mixer, beat eggs in large bowl until frothy. Add sugar 1 tablespoon at a time and beat until pale yellow and slowly dissolving ribbon forms when beaters are lifted. Gently fold in melted chocolate (mixture may lose volume). Add melted butter and vanilla and stir well (mixture may look crudled). Folk in flour. Fold in nuts and chopped chocolate. Pour batter into prepared pan. Bake until toothpick inserted in center comes out not quite clean, about 25 minutes; do not overbake. Cool in pan on rack, (Can be prepared 1 day ahead. Store at room temperature.) Cut brownies into squares. Transfer to plates. Pour sauce over and serve. See Hot Fudge Sauce In This Cookbook

Per serving: 279 Calories; 14g Fat (41% calories from fat); 4g Protein; 40g Carbohydrate; 39mg Cholesterol; 81mg Sodium