Reserved pasta cooking water is then poured into the pan, and pieces of butter are ... mushrooms start to brown, 5 to 7 minutes. Add the garlic, miso, vinegar and soy sauce and stir to combine.
Drain the pasta, reserving some of the cooking water, and add to the butter in the frying pan. Add the grated cheese and a small ladle of the pasta water. Toss together until the cheese has melted ...