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In a pan heat sugar, salt, cocoa powder and butter until combined and butter has melted. Add milk and bring to the boil on medium heat, stirring frequently. Boil for one minute, stirring. Remove from heat and quickly add oats and walnuts, stirring thoroughly. With a spoon form cookie "mounds" on a sheet of wax paper or foil over a baking sheet. Work quickly as, once the mixture cools, it is difficult to shape and becomes crumbly. Let cool. Enjoy!