You can use any height-of-season tomatoes on top of this tart. Just make sure you salt them beforehand to draw out as much water as possible. If you're not in tomato season, cherry tomatoes are sweet and flavorful year round.
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Directions
Preheat the oven to 425 degrees F.
Toss the halved cherry tomatoes with the salt and sugar. Place in a strainer to extract as much moisture out of the tomatoes as possible, tossing frequently, for about 30 minutes. Turn out on a paper towel-lined sheet pan and lightly dab any excess moisture.
Lightly roll out the puff pastry to the size of the sheet pan, then transfer to a greased sheet of parchment on the sheet pan. Dock or prick the center portion with a fork, leaving a 1-inch border for the crust.
Using a pastry brush, spread the Dijon in the center portion of the pastry, leaving the rim untouched. Sprinkle with the Gruyere, avoiding the rim of the pastry.
Let’s get creative. Arrange the halved tomatoes cut-side down, tightly packed, in whatever pattern you’re feeling. Drizzle with olive oil and top with some cracked black pepper, the herbes de Provence and the fresh thyme.
Bake until the border of the tart becomes deep golden brown and the tomatoes start to slightly caramelize, 25 to 30 minutes.
Once cooled, drizzle with the pesto and serve.
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