Heirloom Tomato & Sharp Dijon Tart
Growing up in Paris, a tomato tart was the default summer lunch. But the ones in the bakery display cases often hid a dark secret: a soggy, sad undercarriage. Tight like a bad alibi. When I moved to the Bay Area and started working with heavy, water-logged heirloom tomatoes, I knew I had to engineer a bulletproof base. We're not suffering for brunch. This Heirloom Tomato & Sharp Dijon Tart is my answer. It is café-level baking stripped of the nonsense. We use a lamination-lite rough puff—because weeknights matter—and blind bake it dark. The magic is in the barrier. A thick smear of sharp Dijon mustard and a heavy grating of nutty Comté act as a waterproof shield for the aggressively salted fruit. Salt your tomatoes on paper towels for ten minutes before they hit the pastry. Let time do the work. Make it your own by swapping the Comté for Gruyère, or adding a pinch of flaky salt and fresh thyme before baking. But heed this: bake it until the edges are deep, mahogany golden. A pale crust is a weak crust. Cami’s shortcut note: Use good cultured butter for the dough. Butter is not a garnish. Don't skip this: Salt and drain those tomatoes. Look for a glossy, concentrated finish and a firm crust that doesn't bend when it exits the oven.
Featured Recipe
Heirloom Tomato & Sharp Dijon Tart
The quintessential French café lunch, stripped of fuss but completely uncompromising on texture. A shatteringly crisp, blind-baked butter crust acts as a waterproof shield for sharp Dijon, nutty Comté, and heavy summer tomatoes. We aggressively salt the fruit and bake the pastry dark—because nobody wants a soggy, tight crumb.
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Timeline
Ingredients
- 1.5 lbs heirloom tomatoes(Assorted colors, sliced 1/4-inch thick)
- 1 tsp flaky sea salt(For purging tomato water, plus extra for finishing)
- 1 1/2 cups all-purpose flour(Plus more for dusting)
- 1/2 tsp kosher salt(For the pastry)
- 1/2 cup unsalted butter(European style, cold and cubed)
- 1/4 cup ice water(Keep it freezing cold)
- 1 tsp white vinegar(Tenderizes the dough)
- 3 tbsp Dijon mustard(The strongest, sharpest you can find)
- 1 1/2 cups grated Comté cheese(Aged Gruyère works too)
- 1 tbsp olive oil(For drizzling)
- 1 tbsp fresh thyme leaves(Picked from stems)
Instructions
- 1
Slice 1.5 lbs heirloom tomatoes about 1/4-inch thick. Lay them out in a single layer on a double thickness of paper towels and sprinkle evenly with 1 tsp flaky sea salt. Let time do the work here; pulling out their excess water is the only way to prevent a soggy crust.
5 min
Tip: Don't skip this. Watery tomatoes will ruin your blind bake.
- 2
In a large bowl, whisk 1 1/2 cups all-purpose flour and 1/2 tsp kosher salt. Toss in the cubed 1/2 cup unsalted butter. Smash the butter pieces between your thumbs and index fingers until the mixture looks like coarse wet sand, leaving a few walnut-sized chunks of butter intact. Butter is not a garnish, it’s your flake.
10 min
Tip: Work quickly so the heat of your hands doesn't melt the butter.
- 3
Drizzle in 1/4 cup ice water and 1 tsp white vinegar. Toss gently with a fork just until a shaggy dough forms. Turn it out onto the counter, give it one strong fold over itself to build lamination-lite structure, and press into a 1-inch thick disk. Wrap in plastic and freeze to quick-chill. Preheat your oven to 400°F (200°C).
15 min
Tip: The vinegar breaks down gluten, ensuring the crust is tender, not tough.
- 4
While the dough chills and the oven preheats, the salted tomatoes will passively drain their excess moisture.
30 min
Tip: Leave them alone; they know what to do.
- 5
On a lightly floured surface, roll the chilled dough to a 12-inch circle. Gently transfer and press it into a 9-inch tart pan with a removable bottom. Trim the overhang. Prick the base all over with a fork—we want it blind-baked, not ballooned. Chill in the freezer for 10 minutes to relax the gluten.
10 min
Tip: Pricking (docking) the dough stops steam from creating massive air bubbles.
- 6
Line the chilled crust with crumpled parchment paper (crumpling it makes it fit the corners perfectly) and fill to the brim with pie weights or dried beans. Bake for 20 minutes.
20 min
Tip: Fill the weights all the way up the sides to stop the crust from slumping.
- 7
Carefully remove the parchment and weights. Return the naked crust to the oven and bake for another 10 minutes until the bottom is a confident, deep golden brown. If it’s pale, the finished tart will taste tight like a bad alibi. Bake it dark.
10 min
Tip: A fully baked bottom crust is the secret to café-level tarts.
- 8
Blot the tops of your resting tomatoes aggressively dry with fresh paper towels. Spread 3 tbsp Dijon mustard in an even layer over the hot, blind-baked crust. Scatter 1 1/2 cups grated Comté cheese evenly over the mustard. Layer the dried tomatoes on top in a tight, overlapping spiral.
5 min
Tip: Putting the cheese over the mustard creates an extra fat barrier against the tomatoes.
- 9
Drizzle the layered tomatoes with 1 tbsp olive oil and scatter 1 tbsp fresh thyme leaves over the top. Return the tart to the oven and bake for 25 minutes, or until the cheese is bubbling vigorously at the edges and the tomatoes are tender but hold their shape.
25 min
Tip: Watch the edges of the crust; if they get too dark, shield them with foil.
- 10
Remove from the oven. Let it cool in the pan for at least 15 minutes before unmolding and slicing. We're not suffering for lunch, but molten tomatoes will ruin the roof of your mouth.
15 min
Tip: Cooling allows the cheese to set up so the tart slices cleanly.
Chef's Notes
Cami's shortcut note: You can absolutely use an all-butter store-bought puff pastry if it's a frantic weeknight. Just prick it, blind bake it on a sheet pan under a second heavy baking sheet to keep it flat, then top and bake. But my quick-fold brisée takes 5 minutes of active time and ruins you for anything else.
Camille Roux
Café-level bakes, weeknight methods, zero compromise.
Camille “Cami” Roux was born in Paris with flour in her hair and a healthy skepticism of culinary dogma. She grew up around neighborhood boulangeries that treated crust and crumb like religion—but what stuck with her wasn’t rigid tradition. It was the quiet precision: good butter that actually tastes like milk, patient fermentation that builds flavor for free, and desserts that know when to stop before they get cloying. After moving to the Bay Area, Cami trained in a bread-and-pastry scene obsessed with texture, naturally leavened doughs, and seasonal fruit—Tartine energy, minus the martyrdom. She became known for loaves that sing when they cool, jammy tarts with clean edges, and “how is this so good?” weeknight pastries made with a few smart shortcuts. Her motto is high impact, low fuss: splurge where it counts (butter, salt, time), streamline the rest (sheet pans, one bowl, cold-proofing). If it doesn’t improve flavor or structure, it doesn’t earn a step.