Heat the oil over low heat in a thick-bottomed pan, then caramelize the onions and sugar
45 minutes, stirring regularly.
Prepare the dough; Pour the flour into a bowl, with your fingertips, work the butter with the flour until you obtain fine breadcrumbs.
Make a well in the center, and pour the ice water into it then mix everything together with a spatula. Knead the dough gently on a lightly floured work surface and form a ball. Wrap it in plastic wrap and let it rest for 30 minutes in the refrigerator.
Preheat the oven to 180°; grease a tart pan with a removable rim, spread the dough on the work surface, line the pan with it, remove the excess then let it rest for 10 minutes in the refrigerator.
Blind bake the dough for 10 minutes, remove the beans and parchment paper and continue cooking for approximately 10 minutes until the dough is dry and lightly golden, Let it cool.
Spread the caramelized onions on the bottom of the tart, in a bowl, whisk together the cream, eggs, blue cheese, thyme and a little salt and pepper to taste, pour this mixture over the onions.
Bake and cook
35 minutes, until the filling is firm.
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