Brown Butter Mushroom & Fontina Rough-Puff Tresses

Instructions

1. 1

   Toss 240 g all-purpose flour and 1 tsp fine sea salt together in a wide bowl. Dump in 225 g cold unsalted cultured butter and toss each cube to coat. Using a rolling pin directly in the bowl or on a cool counter, roll flat over the butter cubes until they flatten into wide, thin flakes like shingle tiles. Drizzle 120 ml ice water over the mixture and toss lightly with a fork until large clumps form. Press firmly into a cohesive 1-inch-thick slab, wrap tightly in parchment, and chill in the refrigerator for 20 minutes to firm the butter.

   15 min

   Tip: Do not rub the butter into sand; you want distinct, visible yellow butter sheets. Butter is not a garnish, it is your structure.

2. 2

   Heat 1 tbsp olive oil and 2 tbsp unsalted butter in a wide stainless steel skillet over medium-high heat. When the butter foams and settles into nutty, hazelnut-scented brown specks, scatter 340 g mixed mushrooms (cremini and shiitake) across the pan in a single layer. Let them cook undisturbed for 4 minutes until deeply browned on the bottom, then toss. Stir in 2 medium shallots, 1 tbsp fresh thyme leaves, 0.5 tsp fine sea salt, and 0.5 tsp freshly cracked black pepper. Cook 3 minutes more until tender. Splash in 2 tbsp dry sherry to deglaze, scraping up all browned fond. Cook 1 minute until completely evaporated. Spread the mushrooms on a plate to cool completely.

   12 min

   Tip: Never crowd the pan or mushrooms will steam into rubber. A hard sear delivers deep umami without wet sogginess that ruins pastry.

3. 3

   Whisk 3 tbsp crème fraîche and 1 tsp Dijon mustard together in a small bowl. Stir in the cooled mushroom mixture until evenly coated, keeping 85 g Fontina cheese reserved on the side.

   5 min

   Tip: Make sure the sautéed mushrooms are completely cool before mixing, otherwise they will melt the pastry fats prematurely.

4. 4

   Lightly dust your work surface with flour. Unwrap the chilled dough and roll it out into a 6x15-inch rectangle. Fold the bottom third up and the top third down like a business letter (a tourage turn). Rotate 90 degrees, roll out again to 6x15 inches, and fold into thirds once more. Wrap and chill in the fridge for 15 minutes.

   15 min

   Tip: Work quickly with light pressure. If the butter starts sticking or feeling greasy, park it back in the fridge immediately.

5. 5

   Position a rack in the center of your oven and preheat to 400°F (205°C). Line a heavy rimmed baking sheet with parchment paper.

   5 min

   Tip: High initial heat is essential to flash the water in the butter to steam, blowing the pastry layers wide open.

6. 6

   Roll chilled dough out on a lightly floured surface into a 12x14-inch rectangle, roughly 1/8-inch thick. Trim ragged edges with a sharp knife to expose lacy butter laminations, then cut the sheet into 4 equal rectangles (about 6x7 inches each). Transfer rectangles to the prepared baking sheet. Spread a fourth of the 85 g Fontina cheese down the center third of each rectangle, leaving a 1-inch border at top and bottom. Spoon the mushroom filling evenly over the cheese. Cut 1/2-inch-wide diagonal fringe slits down both long exposed borders. Braid the fringes crisscross over the filling, tucking the ends under to secure.

   15 min

   Tip: Cut slits cleanly with a sharp wheel or paring knife; dragging dull blades seals raw pastry edges together and kills your lift.

7. 7

   Brush the top pastry braids lightly with beaten 1 large egg wash, avoiding the cut exposed sides. Scatter 0.5 tsp flaky sea salt over the top. Slide into the 400°F oven and bake for 22 to 25 minutes, until puffed high, shatteringly crisp, and burnished deep amber brown.

   25 min

   Tip: Check the undercarriage; lift one tress with a metal spatula. It should be uniformly golden and rigid, never pale or damp.

8. 8

   Transfer the baked tresses to a wire cooling rack and let rest for 5 minutes before serving warm.

   5 min

   Tip: Letting them vent on a rack preserves crispness instead of steaming on hot parchment.