01 -
Cook pappardelle in generously salted water according to package directions. Drain, reserving 60ml of the pasta water for later use.
02 -
Heat 15g of butter and olive oil in a large skillet over medium heat. Once butter melts, arrange mushrooms in a single layer and cook undisturbed for 3-4 minutes until they begin to brown. Season with ¼ teaspoon salt and ¼ teaspoon pepper, toss, and continue cooking for 4-5 minutes more, stirring occasionally. When mushrooms are tender with caramelized edges, transfer to a plate and set aside.
03 -
Add remaining 70g butter to the same skillet. Once melted, add diced onion and cook for 3-4 minutes until translucent. Add garlic, thyme, red pepper flakes, ½ teaspoon salt, and ¼ teaspoon black pepper. Cook for 1-2 minutes until fragrant.
04 -
Pour in wine and 60ml broth, increase heat to high, and bring to a boil. Reduce heat to medium and simmer for 5-6 minutes, stirring occasionally, until reduced by about 25% and sauce turns light yellow. Add remaining 60ml broth and continue cooking for 3-4 minutes until sauce develops a deeper golden color.
05 -
Remove mixture from heat and allow to cool for 5-10 minutes. Transfer to a food processor or blender along with lemon juice. Blend 15-30 seconds, scrape down sides, and blend 15-30 seconds more until smooth.
06 -
Return sauce to skillet and add Parmesan cheese. Cook over low heat for 2-3 minutes until cheese partially melts. Add cooked pasta and sautéed mushrooms, tossing until evenly coated. If needed, add reserved pasta water one tablespoon at a time to achieve desired consistency. Serve garnished with parsley and additional Parmesan cheese.