Dried porcini mushrooms and caramelized fresh mushrooms give this dish plenty of deep, earthy flavor. Sweet parsnips, garlicky kale, carrots and potatoes round out the mushroom filling, but if those don’t suit you, the filling is fully flexible. Substitute butternut squash, celery root or just about any root vegetable for the carrots, parsnips and potatoes. The entire dish cooks in a large ovenproof skillet, but you could also transfer the filling to buttered ramekins for individual pies, or divide the mixture between two 8-inch pie dishes for two separate pies. Rich and creamy, it feeds a crowd, and can easily be prepared in advance: Refrigerate the cooked filling overnight, then warm it on the stovetop, assemble and bake. The results justify the effort.
- Serves: 6 persons
- ½cup dried porcini mushrooms (1/2 ounce)
- 4tablespoons olive oil, plus more as needed
- ½pound fresh oyster mushrooms, torn into separate pieces (or shiitake mushrooms, stemmed and halved)
- Kosher salt and black pepper
- ½pound cremini mushrooms, stemmed and quartered (or cut into sixths if large)
- 4tablespoons unsalted butter
- 1large yellow onion, finely chopped
- ¼pound lacinato kale, stemmed, leaves thinly sliced crosswise
- 4garlic cloves, chopped
- 1tablespoon fresh thyme leaves
- 2teaspoons chopped fresh rosemary
- ¼cup all-purpose flour, plus more for dusting
- 1 ½cups chicken or vegetable stock
- ¾cup heavy cream
- 1cup diced peeled carrots (from 2 medium carrots, cut into 1/2-inch pieces)
- 1cup diced peeled parsnips (from 2 medium parsnips, cut into 1/2-inch pieces)
- 1cup diced red potatoes (from 2 small potatoes, cut into 1/2-inch pieces)
- 1(14- to 16-ounce) package puff pastry, thawed
- 1large egg
Step 1Heat oven to 425 degrees. Bring 2 cups of water to boil in a small pot. Place the porcini mushrooms in a medium bowl and pour the boiling water on top; set aside to soak and soften.
Step 2Meanwhile, in a large (12-inch) ovenproof skillet, heat 2 tablespoons oil over medium-high. Working in two batches so the mushrooms brown evenly, add half the oyster mushrooms, season with salt and pepper and cook, undisturbed, until browned underneath, about 3 minutes. Stir the mushrooms, then continue to cook until browned all over, about 3 minutes. Transfer to a medium bowl. Repeat with 2 tablespoons oil and the remaining oyster mushrooms; transfer them to the medium bowl. Add another 2 tablespoons oil, then add the cremini mushrooms, season with salt and pepper and cook, stirring occasionally, until browned and tender, 6 to 8 minutes, lowering the heat as needed to avoid burning. Transfer to the bowl.
Step 3Reduce the heat to medium and add the butter to the skillet. Once the butter is melted, add the onion and cook until starting to soften, about 5 minutes. Add the kale, garlic, thyme and rosemary, season with salt and pepper and cook, stirring occasionally, until softened, about 3 minutes, adding 1 to 2 tablespoons oil if the pan seems dry. Sprinkle with the flour and cook, stirring, until flour is dispersed and lightly toasted, 2 minutes.
Step 4Stirring constantly, gradually add the stock, cream and 3/4 cup of the liquid from the soaking porcini mushrooms. Cook over medium heat, stirring occasionally, until thickened, about 5 minutes. Remove from heat, then stir in the carrots, parsnips, potatoes, and the sautéed mushrooms and any accumulated juices. Strain the soaked porcini mushrooms, discarding any remaining liquid, then roughly chop the mushrooms and stir them into the filling. Season to taste with salt and pepper. (If making ahead, the filling can be refrigerated a day in advance; just warm it up slightly before assembling and baking.)
Step 5On a lightly dusted work surface using a lightly floured rolling pin, roll out the puff pastry into a roughly 14-inch circle. Transfer to the top of the skillet, allowing slight overhang, folding under and pinching any overhang just below the rim of the skillet. In a small bowl, whisk the egg with 1 teaspoon water. Lightly brush the egg wash over the top of the puff pastry, then cut 5 (2-inch) slits into the puff pastry, starting near the center and radiating outward, like the rays of the sun, or create a stripe or crisscross pattern in the puff pastry by gently scoring it with a paring knife without fully cutting through. Crimp the edges using the tines of a fork, if desired.
Step 6Set the skillet on top of an aluminum foil-lined baking sheet and transfer to the middle rack of the oven. Bake until the puff pastry is puffed and golden, about 30 minutes. Let sit 10 minutes before serving.