2. PLACE the butter in a medium saucepan and heat until melted. Line the bottom of a 10-inch round cake tin (spring form works best) with a circle of parchment paper. Then, using a smidgen of the melted butter, grease the inside of the tin including the bottom circle of parchment paper. Leave the tin aside until you are ready to use it.
3. ADD the vanilla to the melted butter, and heat the butter once again until it becomes nut brown. There will be a few sticky brown butter solids at the bottom of the pot; be sure and stir these in. When cooked the mixture should be pale brown and smell slightly nutty. It should take about 5 minutes to make the melted butter nut brown. Take the butter off the heat and leave aside.
4. PLACE the cooled hazelnuts along with the confectioners’ sugar into a food processor and pulse until the nuts are finely ground and incorporated into the sugar. Add the flour, and pulse to combine.
5. WHIP the egg whites and granulated sugar in a stand mixer or in a large bowl using electric beaters. Whisk until fairly stiff: You should be able to turn the bowl upside down without anything spilling out!
6. FOLD both the dry ingredients (hazelnut sugar) and wet ingredients (nut butter) into the egg whites. It’s a little time consuming, but you need to be patient and carefully fold all the ingredients without knocking out any of that precious air. Once everything is incorporated, place the batter into the prepared tin. Place the cake in the oven for about 40-50 minutes. You can check if it’s done by sticking a sharp knife into the center of the cake. The knife should come out clean when the cake is cooked.
7. MAKE the praline: Place the hazelnuts in a large frying pan. Heat over a medium heat for about 3 -5 minutes, until the hazelnuts are golden and just toasted. Then, add the sugar and allow it to caramelize. Once the sugar turns golden brown, pour it and the hazelnuts onto a sheet of parchment paper. Allow to cool and harden for about an hour. Then place the praline into a plastic bag and crush it into small pieces using a rolling pin or heavy object.
8. DECORATE: Halve the cake and fill the middle with whipped cream; add the second layer and place more whipped cream on top. This is not a very high-risen cake, so this is the best way to serve it. Garnish the top with the hazelnut praline pieces.
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