Heat the milk with the sugar and the chocolate so that they melt.
In a heavy-bottomed saucepan, melt the butter, add the flour, and mix vigorously, letting it cook for a few minutes.
Add the hot chocolate milk, gradually, while stirring. Leave to cook for ten minutes.
Pour into a pretty bowl or individual ramekins and enjoy cold.
A chocolate cream without eggs:a practical recipe when you have no more eggs in your fridge!