Preparation Preheat oven to 250°F. Melt butter in a heatproof serving bowl in middle of oven, about 5 minutes. Cook fettuccine in a 6- to 8-quart pot of boiling salted water until al dente. Reserve 1/2 cup pasta cooking water, then drain fettuccine in a colander. Immediately toss fettuccine with butter and salt in bowl, then slowly add 3/4 cup cheese, tossing constantly and adding enough of cooking water to keep pasta moist. Season with salt and pepper to taste, then sprinkle with remaining cheese.
Preparation Preheat oven to 250°F. Melt butter in a heatproof serving bowl in middle of oven, about 5 minutes. Cook fettuccine in a 6- to 8-quart pot of boiling salted water until al dente. Reserve 1/2 cup pasta cooking water, then drain fettuccine in a colander. Immediately toss fettuccine with butter and salt in bowl, then slowly add 3/4 cup cheese, tossing constantly and adding enough of cooking water to keep pasta moist. Season with salt and pepper to taste, then sprinkle with remaining cheese.