01 -
Follow the directions on the pappardelle's packaging to cook it in salty water. Drain the pasta and save 60ml of the water for later if needed.
02 -
In a large pan, heat 15g of butter with olive oil over medium heat. Let the butter melt, then spread mushrooms in a single layer. Let them brown undisturbed for 3-4 minutes. Add a pinch of ¼ teaspoon each of salt and pepper, stir, and cook another 4-5 minutes, stirring occasionally, until tender and a little caramelized. Move them to a plate.
03 -
Using the same pan, melt the remaining 70g of butter. Toss in the onion and stir for 3-4 minutes until soft. Mix in the garlic, thyme, red pepper flakes, ½ teaspoon of salt, and ¼ teaspoon of black pepper. Cook and stir for about 1-2 minutes until fragrant.
04 -
Pour in the wine and 60ml of the broth, crank the heat to high, and bring to a boil. Lower the heat to medium and simmer for 5-6 minutes, stirring occasionally, until the sauce reduces slightly and looks light yellow. Add the second half of the broth and cook it 3-4 minutes more, until darker in golden tones.
05 -
Take the skillet off the heat and cool the mixture for about 5-10 minutes. Pour everything into a blender or food processor along with the fresh lemon juice. Blend for 15-30 seconds, scrape the sides, and blend again until it’s smooth.
06 -
Put the sauce back in the pan and mix in Parmesan cheese over low heat. Stir for 2-3 minutes to let the cheese melt lightly. Add the cooked pasta and mushrooms, tossing everything to coat. Stir in reserved pasta water little by little if it feels too thick. Sprinkle parsley and extra Parmesan on top while serving.