Melt the margarine in a pan. Add the chocolate (in squares) and stir it all so it’s all nice and melted. Add the condensed milk. Then stir in the cocoa.
Stir it all up nice and lovely. Probably keep it on low heat so it doesn’t burn.
Grease and add baking paper to an oven tray. Then pour the yummy mix into the tray, level it all out and refriderate. It should take about an hour or so to completely cool. Cut into squares and eat! And enjoy the heavenly yummyness.