Step 1
Preheat oven to 375°F (180°C). Grease the bottom of two 8 inch (20 centimetre) cake pans and line the bottom with greased parchment paper.
Step 2
In the bowl of a food processor, fitted with metal blade, process the hazelnuts with ¼ cup (50 grams) Redpath® Granulated Sugar until the mixture is finely ground; about 45 seconds.
Step 3
Into a large bowl, sift the flour. Whisk in the hazelnut mixture and sift again. Any large pieces of hazelnut can be put back in the food processor to be processed again.
Step 4
In a medium saucepan, heat 1 inch (2.5 centimetres) of water to a gentle simmer.
Step 5
In a large heatproof bowl, whisk together the eggs, egg yolks, remaining sugar, vanilla and salt.
Step 6
Set bowl over simmering water and whisk until the mixture reaches 110°F (43°C) on an instant read thermometer; about 9 minutes.
Step 7
Place warmed egg mixture in the bowl of a stand mixer, fitted with the whisk attachment. Beat until mixture is pale and thickened; 8 to 10 minutes.
Step 8
Sift the flour mixture over the eggs mixture in two additions, and gently fold in each addition using a rubber spatula.
Step 9
Pour the cooled melted butter down the side of the bowl; fold in.
Step 10
Divide the batter evenly between the prepared pans.
Step 11
Bake until cake springs back when pressed, and a cake tester inserted into the centre of the cake emerges clean; 25 - 30 minutes.