Asparagus–Raclette Rough-Puff Slab Tart (Cornichon Crème + Warm Lentil Frisée Salad)
This is my French café winter lunch: a shatter-crisp rough-puff slab tart with asparagus, melty raclette, and a sharp little cornichon crème that keeps it from going heavy. On the side, a warm lentil–frisée salad soaks up the vinaigrette and plays nicely with flaky pastry—salad-friendly, fork-friendly, zero drama. It’s the kind of lunch that tastes like you left the house, even if you didn’t.
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Ingredients
- 250 g All-purpose flour(plus extra for dusting)
- 6 g Fine sea salt(about 1 tsp)
- 225 g Unsalted cultured butter(very cold, cut into 1.5 cm cubes)
- 120 g Ice water(about 1/2 cup, plus a splash if needed)
- 1 1/2 tbsp Dijon mustard(for the tart base)
- 120 g Crème fraîche(about 1/2 cup, for cornichon crème)
- 35 g Cornichons(finely chopped (about 4–5), plus 1 tsp brine)
- 1/2 tsp Freshly ground black pepper(to taste)
- 450 g Asparagus(greenhouse is fine; medium-thick spears work best)
- 2 tbsp Olive oil(divided)
- 150 g Raclette cheese(sliced or grated; substitute Comté if needed)
- 1 Egg(beaten with 1 tsp water for egg wash)
- 1 pinch Flaky salt(for finishing)
- 300 g Cooked French green lentils(about 1 1/2 cups; canned is fine, rinsed and drained)
- 80 g Frisée (curly endive)(about 3 packed cups, torn into bite pieces)
- 1 Shallot(small, finely sliced)
- 1 1/2 tbsp White wine vinegar(for vinaigrette)
- 1 tsp Whole-grain mustard(for vinaigrette)
- 1 tsp Lemon zest(optional but excellent)
- 40 g Toasted walnuts(roughly chopped)
- 2 tbsp Chives(finely sliced)
- 1 tsp cornichon brine(Brine from chopped cornichons used in cornichon crème)
Instructions
- 1
Tight mise en place: cube 225 g Unsalted cultured butter and chill it; set a small cup of 120 g Ice water in the freezer. Line a sheet pan with parchment. Clear a space in your fridge for a flat pastry packet (a quarter sheet pan fits perfectly).
10 min
Tip: Cold is the whole game with rough puff. If your kitchen is warm, chill your mixing bowl too.
- 2
Make the rough puff (one bowl): whisk 250 g All-purpose flour and 6 g Fine sea salt. Toss in the cold butter cubes and smash them between your fingers into big, flat shards—some pea-size, some almond-slice size. Drizzle in 120 g Ice water and mix with a fork until you get a shaggy, just-holding-together dough. If it’s dusty, add 1–2 tsp more water.
10 min
Tip: You’re not making a smooth dough. Visible butter = future layers.
- 3
First fold: tip the shaggy dough onto a lightly floured counter, press into a rough rectangle, then roll to about 20 x 30 cm. Fold into thirds like a letter. Rotate 90°, roll again, fold again. Wrap and chill 20 minutes.
25 min
Tip: If butter starts smearing (shiny streaks), stop and chill—no heroics.
- 4
Second fold: repeat the roll + letter fold once more (two folds total today). Wrap and chill at least 30 minutes (or up to 24 hours).
35 min
Tip: Fridge is your friend. Time firms the butter so the puff actually puffs.
- 5
Prep the asparagus: heat oven to 220°C / 425°F. Snap or trim woody ends. If spears are thick, peel the bottom third. Toss 450 g Asparagus with 1 tbsp olive oil and 1 pinch Flaky salt; set aside.
10 min
Tip: Peeling thick asparagus is not precious—it keeps the bake tender instead of stringy.
- 6
Roll and build the slab: roll chilled dough on lightly floured parchment into a rectangle about 25 x 35 cm (3–4 mm thick). Slide parchment onto your sheet pan. Score a 2 cm border all around (don’t cut through). Dock (poke) the center with a fork.
10 min
Tip: Scoring creates a clean ‘frame’ so your edges rise high and crisp.
- 7
Base + cheese: spread 1 1/2 tbsp Dijon mustard over the docked center. Scatter half the 150 g Raclette cheese over the Dijon (this is your moisture barrier). Arrange 450 g Asparagus in a single layer, tips pointing the same way (café vibes). Top with remaining 150 g Raclette cheese.
8 min
Tip: Cheese under the veg matters—it insulates the pastry from asparagus steam.
- 8
Egg-wash the border, then bake 22–28 minutes until the edges are deeply golden and the center is bubbling. Rotate the pan at minute 15 for even color.
28 min
Tip: Don’t pull it at ‘light tan.’ You want real mahogany at the edges for that shatter.
- 9
While it bakes, make cornichon crème: mix 120 g Crème fraîche with 35 g Cornichons, 1 tsp cornichon brine, 1/2 tsp Freshly ground black pepper, and (optional) 1 tsp Lemon zest. Chill.
5 min
Tip: This is the bright, sharp counterpoint. Without it, raclette can feel sleepy.
- 10
Make the warm lentil frisée salad: in a bowl, whisk 1 1/2 tbsp White wine vinegar + 1 tsp Whole-grain mustard + a pinch of salt. Whisk in 1 tbsp olive oil. Add 1 Shallot and let it sit 5 minutes to soften. Toss in 300 g Cooked French green lentils, then 80 g Frisée (curly endive), 40 g Toasted walnuts, and 2 tbsp Chives.
10 min
Tip: Warm lentils slightly wilt the frisée so it eats like a café salad, not lawn clippings.
- 11
Finish and serve: rest tart 5 minutes (layers set as they cool). Hit asparagus with 1 pinch Flaky salt. Slice into squares. Serve with a spoonful of cornichon crème and the warm lentil frisée salad on the side.
8 min
Tip: If you slice too hot, the center can slide. Five minutes is the sweet spot.
Chef's Notes
Why it works: rough puff gives you lamination without the all-day project—big butter shards + a couple folds = lacy, crisp layers. The Dijon + under-cheese layer is my non-negotiable moisture barrier, so the bottom stays snappy, not tight like a bad alibi. Cami’s shortcut note: you can make the dough up to 2 days ahead and keep it in the fridge; or freeze it after the folds (thaw overnight in the fridge). The salad can be fully prepped while the tart chills. Don’t skip this: bake it darker than you think, and let it rest 5 minutes before slicing. Pale puff is just soft pie dough in disguise.
Frequently Asked Questions
How long does Asparagus–Raclette Rough-Puff Slab Tart (Cornichon Crème + Warm Lentil Frisée Salad) take to make?
Asparagus–Raclette Rough-Puff Slab Tart (Cornichon Crème + Warm Lentil Frisée Salad) takes about 1 hour 13 minutes total. That includes 45 minutes of prep and 28 minutes of cooking.
How many servings does this recipe make?
This recipe makes 4 servings.
What skill level is needed for Asparagus–Raclette Rough-Puff Slab Tart (Cornichon Crème + Warm Lentil Frisée Salad)?
This recipe is rated medium — it's intermediate, requiring some cooking experience.
What ingredients do I need for Asparagus–Raclette Rough-Puff Slab Tart (Cornichon Crème + Warm Lentil Frisée Salad)?
The main ingredients are: All-purpose flour, Fine sea salt, Unsalted cultured butter, Ice water, Dijon mustard, Crème fraîche, Cornichons, Freshly ground black pepper, Asparagus, Olive oil, Raclette cheese, Egg, Flaky salt, Cooked French green lentils, Frisée (curly endive), Shallot, White wine vinegar, Whole-grain mustard, Lemon zest, Toasted walnuts, Chives, cornichon brine.
What type of meal is Asparagus–Raclette Rough-Puff Slab Tart (Cornichon Crème + Warm Lentil Frisée Salad)?
Asparagus–Raclette Rough-Puff Slab Tart (Cornichon Crème + Warm Lentil Frisée Salad) is categorized as: lunch, salad.
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