Tomato tart on a bed of Dijon mustard is a great classic of French home cooking. I give you my tips and variations to make it easy to make and, above all, an absolute delight. Optional: Add feta or mozzarella cheese. Don't worry; mustard's strength lowers when cooked.
Rinse and dry the tomatoes. Lay out paper towels on a large plate.
Cut the tomatoes into slices. Remove the seeds and juice. Place them on the paper towel to drain well.
Sauté the onions
Heat a tablespoon of olive oil in a frying pan. Peel and chop the onion and garlic. Add them to the pan, season with salt and a little herbes de Provence, and fry for ten minutes over medium-high heat.
Prepare the tart
Roll out the pie pastry in a tart pan. Place a large tablespoon of Dijon mustard and 2 tablespoons of cream cheese in the center. Mix together and spread over the whole tart base.
Cover with the sautéed onions.
Arrange the tomato slices, season with salt and pepper and sprinkle with herbes de Provence.
Bake
Bake the tart for 30 to 40 minutes at 180°C / 350°F.
If you choose feta or mozzarella cheese, add the crumbled cheese 5 to 10 minutes before the end of the baking time. If you choose burrata, place it in the center of the tart as soon as it comes out of the oven.