Combine together sugar, cocoa powder, rice flour, cornflour and salt in a saucepan. Add milk to that and mix until homogenous

Place this on the gas stove and stir continuously until it you see small bubbles around the edges of the pan

At this stage add the cream and finely chopped chocolates. Stir until the chocolate is dissolved and the mixture thickens say about another 3 mins

Transfer it to serving glasses and refrigerate until set.