Old fashioned Square No Bake Cookies

1/2 cup milk
2 cups sugar
1/2 cup butter
3 tablespoons cocoa
1/2 cup peanut butter
3 cups rolled oats
1 cup chopped nuts
1/2 teaspoon vanilla
1/2 teaspoon salt

Mix sugar, butter, cocoa, and milk in a large saucepan. Boil for about 5 minutes, stirring constantly. Remove from heat and add peanut butter. Stir until blended. Add rolled oats, nuts, vanilla, and salt. Put into 8"x8" square pan and chill. Cut into squares.