Cocoa Butter Beans Roll Cake

Preheat oven to 200℃. Line the base and sides of a Swiss roll pan with baking paper.

Use an electric mixer to whisk Eggs and Sugar and make the mixture very thick and pale. Add Milk, Butter and Salt, mix to combine, the volume will be slightly reduced but do not worry, sift in the combined Flour and Cocoa Powder, and gently combine.

Pour into the prepared pan and smooth the surface. Bake for 10-12 minutes or until the surface is dry to the touch.

To make the filling, rinse Butter Beans well, place all Butter Beans into a food processor or blender and make them into paste. Add Sugar (and pinch of salt if Butter Beans are unsalted), Cocoa Powder, Rum, then process until it gets smooth paste texture. Adjust the thickness by adding Milk.

Place the sponge onto a clean work surface and peel the baking paper, but do not remove the paper. Spread the filling over the sponge, whichever side you prefer, then roll sponge to enclose filling using the paper.