Melt butter, chocolate and marshmallows together in top of double boiler. Mix remaining ingredients in a very large bowl. Pour melted chocolate sauce over dry ingredients in bowl and mix thoroughly. Then spoon the mixture into milk carton. Pack tightly and place in refrigerator. In about 1 hour your nut log will be firm and ready to serve. Peel the carton away, slice.
Makes about 24 servings.
Cajun Country -- New Iberia, Louisiana