Spiced Apple & Brown Butter Hazelnut Rough-Puff Dartois

Instructions

1. 1

   In a large bowl, whisk together 250 g all-purpose flour and 1 tsp fine sea salt. Toss in 225 g unsalted cultured butter. Flatten each butter cube between your thumb and index finger into thin shingle-like sheets—do not rub them down into tiny peas. Pour in 120 ml ice water and mix with a fork just until a shaggy dough comes together. Turn out onto plastic wrap, press into a rough 1-inch thick rectangle, wrap tightly, and chill for 30 minutes.

   15 min

   Tip: Visible butter chunks are mandatory here; they create the steam that lifts your layers. A tight dough means a tough crumb like a bad alibi.

2. 2

   Place the dough package into the refrigerator to chill and rest.

   30 min

   Tip: Let time do the work. Cold butter is non-negotiable for real flakiness.

3. 3

   While dough chills, melt 30 g unsalted butter in a wide skillet over medium heat. Keep cooking until it foams and turns golden brown with a nutty aroma, about 3 minutes. Add 3 medium Honeycrisp apples, 50 g granulated sugar, 0.5 tsp ground cardamom, and 1 tsp fresh lemon juice. Sauté for 6 to 8 minutes until apples are soft around the edges but still hold their shape. Remove from heat and spread on a plate to cool completely.

   10 min

   Tip: Why it works: Pre-cooking apples drives off moisture before baking, preventing a soggy bottom on your pastry base.

4. 4

   In a small bowl, make the hazelnut frangipane. Brown the remaining 15 g unsalted butter in a small pan, then let cool 2 minutes. Stir together cooled brown butter, 50 g hazelnut meal, 2 tbsp brown sugar, and 1 large egg yolk until a smooth, thick paste forms.

   5 min

   Tip: Butter is not a garnish—browning it adds depth that cuts through sweet cooked fruit.

5. 5

   Roll chilled dough on a well-floured surface into a 10x15-inch rectangle. Fold top third down and bottom third up like a business letter (turn 1). Rotate 90 degrees, roll out again to 10x15 inches, and repeat the letter fold (turn 2). Roll into a final 12x16-inch rectangle and slice lengthwise into two equal 6x16-inch strips.

   15 min

   Tip: Keep edges neat and sharp to encourage straight, high-rising puff layers.

6. 6

   Transfer one strip of pastry to a parchment-lined sheet pan. Spread hazelnut frangipane down the center, leaving a 1-inch border along the edges. Top frangipane evenly with cooled cardamom apples. Brush borders lightly with water. Lay the second pastry strip over top, gently pressing edges together to seal. Score shallow diagonal slashes across top crust with a sharp knife.

   10 min

   Tip: Do not slice through the top layer completely; shallow scoring lets steam escape cleanly.

7. 7

   Transfer assembled Dartois on its sheet pan into the refrigerator to chill while preheating the oven.

   15 min

   Tip: Chilling relaxes the gluten and hardens the butter, preventing butter leak in the hot oven.

8. 8

   Preheat oven to 400°F (200°C). Whisk the remaining egg white (from the 1 large egg) with 1 tsp water to create an egg wash. Brush top crust lightly with egg wash, sprinkle evenly with 2 tbsp coarse turbinado sugar and 0.5 tsp flaky sea salt.

   5 min

   Tip: Avoid egg wash dripping down the sliced cut sides—it glues layers together and halts rising.

9. 9

   Bake at 400°F (200°C) for 28 to 32 minutes, until puff is dramatically expanded, deep golden brown, and lacquered on top.

   30 min

   Tip: Look for a deep mahogany hue. Pale pastries are sad, doughy pastries.

10. 10

    Let cool on the sheet pan for 10 minutes, then slice crosswise into 6 thick, lacy strips using a serrated bread knife. Serve warm.

    10 min

    Tip: Use a gentle sawing motion with a serrated knife so you crack the flaky crust cleanly without crushing it.