Heat a large skillet over medium-low heat and add the butter. As soon as it melts, add the asparagus, salt and pepper and stir constantly while cooking, increasing the heat to medium. Toss and stir as the butter browns and the asparagus cooks – for about 5 to 6 minutes. As soon as the pasta is finished cooking, drain and toss it into the skillet with the asparagus. Pour over about 3/4 of the fonduta and toss well to coat, adding more if needed/desired. Serve with extra grated cheese and a sprinkling of fresh basil leaves on top.