Dubbed the "father" of Nutella by the Italian media, Rivella helped create the world's most famous hazelnut spread ... hazelnuts, milk, cocoa, lecithin and vanillin. World Nutella Day, established ...

Pour the hot milk over the egg mixture ... adding as much as necessary to form a spreadable consistency. For the hazelnut praline, line a baking tray with non-stick baking paper.

Pop the chocolate hazelnut spread into a bowl with the milk and heat in the microwave in 10-second bursts until the mixture is runny and viscous, but not steaming hot. This should not take more ...