Pasta needs to cook at a full boil to ensure an even al dente texture. The sauce, made of cream, porcini, and porcini soaking liquid, simmers and reduces for a short time to thicken it enough to cling to the pasta.
1/2 cup boiling water
1/4 cup dried porcini mushrooms (about 1/4 ounce)
12 ounces uncooked fettuccine
1/2 cup whipping cream
3/4 teaspoon salt
1/4 teaspoon freshly ground black pepper
6 tablespoons grated Parmigiano-Reggiano cheese
2 tablespoons (1-inch) cut fresh chives
How to Make It
Combine 1/2 cup boiling water and mushrooms in a small bowl; cover and let stand 30 minutes or until soft. Drain through a sieve over a bowl, reserving soaking liquid. Finely chop mushrooms.
Cook pasta according to package directions, omitting salt and fat. Drain in a colander over a bowl, reserving 1/4 cup pasta water.
Combine mushrooms and cream in a medium saucepan over medium heat; bring to a simmer. Stir in salt, pepper, and reserved mushroom soaking liquid; simmer 5 minutes or until slightly thickened. Add pasta and reserved 1/4 cup pasta water to pan; toss well to coat. Sprinkle with cheese and chives. Serve immediately.