For the countertop, beat the egg whites with a little salt (I use the target), then gradually add the sugar that we grind to melt faster, alternating with lemon juice.
Gradually added lemon juice helps to strengthen the meringue, that's what I learned from a neighbor, a confectioner long gone.
Then gradually add the ground walnuts alternating with the flour.
We line the tray with baking paper (I used a 25x36 cm tray) we put the meringue and level it with the blade of a knife, then we put the tray in the preheated oven, for 30-35 minutes at 180 degrees, but we also do the test for safety with the toothpick.
For white glaze, break the chocolate into small pieces and put it in a bowl, drip the oil and melt the chocolate on a steam bath to make sure it does not stick to the walls of the bowl.
Spread the hot chocolate over the slightly cooled countertop.
We cool the tray to harden the white chocolate.
For caramel, put in a bowl, over low heat, 8 tablespoons of sugar and caramelize it, stirring constantly so that it does not burn.
Add the butter and mix quickly because it will harden in places, but it will not be a problem because eventually it will melt, then add the yolks mixed with a little salt and the rest of the sugar and leave the bowl on the fire, stirring constantly, until when the cream thickens like a pudding.
Lift the bowl off the heat and add the hazelnuts, then let the bowl cool, but don't leave it too long, just enough to support the finger when trying.
Pour the caramel over the white icing, then let the tray cool again to harden the caramel, about 10 minutes in the refrigerator.
For the black glaze, we put in a bowl, on a steam bath, the chopped dark chocolate and mixed with the oil and we leave it until it melts, stirring from time to time.
We lift the bowl from the steam bath and let it cool for a few minutes, not too much so that it doesn't harden, then we spread the icing over the caramel.
Let the tray cool again, then we can slice the cake.
I couldn't resist and I cut from the corners which were very good and not cold !!