In a bowl, add condensed milk, nuts, dark chocolate and butter

Using Double boiler, melt the contents

Keep stirring until chocolate is completely melted. You can microwave it alternatively however while microwaving, keep stirring after every 40 seconds until chocolate is melted

Grease a square dish or add butter paper

Pour the melted chocolate mixture into the dish. Allow to cool. Refrigerate until set. I have added additional nuts just for garnishing