I used to make this all the time when the kids were little. I would mix 1/2 cup cocoa with 1 1/2 cups regular sugar in a sauce pan. Then stir in the can of evaporated milk. Stir constantly and bring to a boil. Have a cup of water on the side while cooking. I would continue cooking until the mixture would come to a soft ball when a little was dropped in the the water and could retain it's shape. When finished, I would add just a tablespoon of butter and a teaspoon of vanilla and serve hot over ice cream. When the hot mixture hits the ice cream it gets chewy and the kids loved that. Never really saw an exact recipe for this. Give it a whirl.