Savory tart with caramelized onions and flavorful potatoes

Slice the onions and sauté them in a pan over high heat with oil and salt.

When they soften, add a glass of water and the brown sugar.

Cut the potatoes into very small cubes and sauté them in a pan with two glasses of water.

If the water evaporates, add another glass until they are soft.

Season the potatoes with oil, salt, pepper, paprika, and garlic powder, then add half of the Parmesan.

Roll out the puff pastry and prick it with a fork.

Add the caramelized onions to the base, the cheese, and the potatoes.

Fold the edges of the puff pastry back and brush them with the egg yolk.

Sprinkle with the remaining Parmesan.

Bake at 180°C for 20-25 minutes.