This is a fast recipe so start by preparing all the ingredients.
Separate 50 gr of sugar and mix them with the eggs until incorporated.
Chop the walnuts in a food processor to a rough consistency. You still want to taste their crunch when you eat the cake.
Cut the butter into smaller pieces.
Add the sugar to a large pan and melt over low heat. This will take some time.
Use a whisk to mix from time to time.
Beware not to burn the sugar.
Once the melted sugar has a beautiful golden brown colour, add the butter.
Whisk continuously to incorporate.
Add the eggs and mix slowly, pouring it gently into the melted sugar whilst you whisk vigorously so you don’t cook the eggs.
Once incorporated, remove the pan from the heat and add the walnuts, rum essence, and a pinch of salt.
Mix well.
Cover your working surface with cling foil and lay the first wafer sheet in the middle, with the waffled side facing up.
Spread caramel and walnut sauce evenly, to cover the entire sheet.
Place another sheet on top, again with the waffled side up and repeat the process.
Repeat until you finish the waffle sheets. Cover the cake with the last waffle sheet.
Wrap the cling film around the cake and place some heavy weights above it. I used three cookbooks.
Let them sit with the weight on top for at least 3 hours – best overnight.
Once the cream is hard and the wafers have softened, it’s ready to serve.
Cut the edges and discard them if they don’t have any cream between them.
Cut the wafers into the desired shape (rectangular or diamond) and serve.