Red onion parmesan tarte tatin: chic, easy vegetarian Christmas dish

Vegetarian and flexitarian diets have surged in France over the last decade, especially among young adults. If you want a festive, meat-free centerpiece, this red onion tarte tatin with parmesan crisps brings caramelized sweetness and crunchy saltiness to the table. It’s elegant, simple, and perfect for a Christmas meal.

Essential ingredients for 6 people — what you need

• 20 g unsalted butter
• Brown sugar (to taste)
• 2 tbsp balsamic vinegar
• 8 small red onions
• 220 g plain wheat flour (T55)
• 30 g grated Parmesan
• 1 tbsp za’atar (or dried thyme)
• 100 g soft salted butter
• Cold water

Step-by-step: make the shortcrust with Parmesan and za’atar

Mixing the dough

1. Combine flour, grated Parmesan and za’atar in a large bowl.
2. Cut the cold butter into small cubes and rub into the dry mix with your fingertips.
3. Stop when the mixture looks like coarse breadcrumbs.
4. Add a little cold water at a time until dough holds together.
5. Shape into a disk, wrap in plastic, and chill for 30 minutes.

How to caramelize the red onions for deep flavor

Preparing and cooking the onions

1. Peel each red onion and halve them. Remove the core if it is tough.
2. Melt butter in an ovenproof skillet and tilt so it coats the base and sides.
3. Add a tablespoon of sugar; let it soften and begin to caramelize.
4. Arrange the onion halves flat-side down, packing them tightly.
5. Season lightly and cook over low heat for about 10 minutes. Press gently now and then.
6. Pour in the balsamic vinegar and sprinkle a teaspoon of brown sugar.
7. Transfer the skillet to a preheated oven at 180°C for about 20 minutes.
8. The onions should be glossy, very tender and slightly caramelized.

Crunchy Parmesan crisps — quick garnish to elevate the dish

1. Finely grate the Parmesan.
2. On a baking sheet lined with parchment, place four 6 cm circles of grated cheese spaced apart.
3. Bake at 180°C for 5–7 minutes until melted and lightly golden.
4. Let cool completely so the discs harden into crisps.

Assemble the tarte tatin and finish in the oven

1. Roll the chilled pastry between two sheets of parchment into a disk slightly larger than your skillet.
2. Trim a circle about 1 cm wider than the pan diameter.
3. Lay the pastry over the onions and tuck the edges down between the filling and pan with a spoon.
4. Prick the top lightly with a knife to allow steam to escape.
5. Bake at 180°C for 25–30 minutes, until the pastry is golden brown.
6. Let the tart rest 5 minutes after removing from the oven.
7. Invert carefully onto a wire rack or serving plate to unmold the tarte tatin.
8. Scatter broken Parmesan crisps over the tarte just before serving for contrast in texture.

Useful tips, swaps and timing for a flawless tart

• If your skillet is not ovenproof: finish the onion stage on the stovetop and bake the assembled tart in a baking dish. Add 10 extra minutes to the oven time.
• For a herby alternative, replace za’atar with dried thyme or rosemary.
• To make it vegetarian-friendly, use a vegetarian Parmesan or nutritional yeast for a similar umami note.
• Prepare the dough and crisps a day ahead to save time on the day of serving.
• Serve warm with a simple green salad or roasted winter vegetables.

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Sienna Blake

Sienna curates soulful lifestyle content with a focus on intentional living, slow habits, and modern creativity. Her voice blends beauty, function, and joy.