Fudge-Nut Brownies
["6 (1 oz.) sq. unsweetened chocolate", "3/4 c. margarine or butter (1 1/2 sticks)", "6 large eggs", "2 1/2 c. sugar", "1 1/2 tsp. vanilla extract", "1/2 tsp. salt", "1 1/2 c. all-purpose flour", "1 (8 oz.) can walnuts, chopped"]
["About 2 1/2 hours before serving or early in the day:"]
["unsweetened chocolate", "margarine", "eggs", "sugar", "vanilla extract", "salt", "flour", "walnuts"]