
Silky butter and freshly grated Parmigiano-Reggiano come together over low heat with a splash of starchy pasta water, building a glossy sauce that clings to every strand instead of pooling in the bowl. The technique here is all about patience — melting, emulsifying, and tossing vigorously so the cheese turns creamy rather than clumping — and the payoff is a restaurant-worthy coating with real body and shine. A crack of black pepper at the end adds just enough bite to balance the richness. It's a fast, five-ingredient sauce that proves simple technique beats a long ingredient list, and it's a great pick for a gluten free dinner rotation when you build it on pasta made to fit.
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Bring a large pot of water to a boil over high heat. Salt generously — the water should taste pleasantly salty. Add the fettuccine and cook, stirring occasionally, until al dente, tender with a slight resistance at the center, about 1–2 minutes less than the package directions.
Before draining, use a ladle to scoop out at least 1 1/2 cups of pasta cooking water and set it aside. Drain the pasta, reserving the water.
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