Ingredients

1. 1 pound asparagus
2. 1 tablespoon olive oil
3. 2 teaspoons salt
4. 1/2 teaspoon fresh-ground black pepper
5. 1/2 cup plus 2 tablespoons balsamic vinegar
6. 1/2 teaspoon brown sugar
7. 1 pound penne
8. 1/4 pound butter, cut into pieces
9. 1/3 cup grated Parmesan cheese, plus more for serving

1. Heat the oven to 400°. Snap the tough ends off the asparagus and discard them. Cut the spears into 1-inch pieces. Put the asparagus on a baking sheet and toss with the oil and 1/4 teaspoon each of the salt and pepper. Roast until tender, about 10 minutes.
2. Meanwhile, put the vinegar in a small saucepan. Simmer until 3 tablespoons remain. Stir in the brown sugar and the remaining 1/4 teaspoon pepper. Remove from the heat.
3. Cook the penne in a large pot of boiling, salted water until just done, about 13 minutes. Drain the pasta and toss with the butter, vinegar, asparagus, Parmesan, and the remaining 1 3/4 teaspoons salt. Serve with additional Parmesan.