Slice potatoes thinly using a mandolin or a knife.
Layer caramelized onions, potatoes, beef stock, and clarified butter in a baking dish.
Season each layer with salt, black pepper, and fresh thyme.
Cover with a cartouche (parchment paper lid) and bake at 120°C for about 1 hour.
Remove the cartouche, increase the temperature to 130°C, and continue baking for another 25 minutes.
Glaze the top with more clarified butter and beef stock, ensuring even coverage.
Finish with a sprinkle of fresh thyme and bake for an additional 5 minutes.
Serve and enjoy the crispy, tender, and flavorful layers of caramelized onion and potato bake.
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