01 -
Bring a large pot of salted water to a boil. Cook the spaghetti or linguine according to package instructions until al dente. Reserve 1 cup of the cooking water, then drain the pasta.
02 -
While pasta cooks, heat olive oil in a large skillet over medium-high heat. Add sliced Brussels sprouts and a pinch of salt. Sauté for 6 to 8 minutes, stirring occasionally, until golden and crisp. Transfer sprouts to a bowl and set aside.
03 -
In the same skillet, reduce heat to medium. Add unsalted butter and cook, stirring frequently, until it foams and turns golden brown with a nutty aroma, about 3 to 4 minutes.
04 -
Add sliced garlic and crushed red pepper flakes to the butter. Sauté for 30 seconds, stirring gently until fragrant. Do not let the garlic brown.
05 -
Return sautéed Brussels sprouts to the skillet. Add drained pasta and toss thoroughly to combine with the butter, garlic, and sprouts.
06 -
Add grated parmesan, lemon zest, lemon juice, and a splash of reserved pasta water. Toss until pasta is evenly coated with the sauce, adding more pasta water as needed for desired consistency.
07 -
Season with additional salt and freshly ground black pepper to taste. Serve immediately, topped with extra parmesan, toasted nuts, and chopped parsley if desired.