This silky sauce comes together with just a handful of components: melted butter emulsified with starchy pasta water until it turns glossy and slightly creamy, then tossed with finely grated Parmigiano-Reggiano until every strand is coated in a smooth, clinging layer. A finish of freshly cracked black pepper adds just enough bite to balance the richness. The technique here is all about patience — building the emulsion slowly and adding the cheese in stages so the sauce stays fluid instead of clumping. Toss it with your favorite pasta while everything's still warm, and you'll get that same restaurant-style sheen and cling in every bite. It's a comforting, cheese-forward classic that fits neatly into a Low FODMAP kitchen, no fuss required.
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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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