1- In a large pot, pour your water, salt it then bring to a boil using a large spoon, place your eggs for a cooking time of 4 minutes.
2- Meanwhile, remove the large ribs from your spinach and wash them in three changes of water.
3- Remove your eggs, plunge them into cold water and shell them.
4- In a large pan, melt the butter until it reaches a "brown butter" color, then place your spinach leaves, salt, pepper then after two minutes, cover and turn off your heat.
5- In a fairly wide pot, pour the cream, salt and pepper, add your grated nutmeg then bring to a boil and add your 4 eggs just to heat them.
6- In a large oven-safe dish, pour your spinach, place your eggs, the roasted hazelnuts, your cream, then sprinkle with your parmesan.
7- Place your dish in the middle of the oven on broil setting and remove it when it is well browned.
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