Serves 4.
1 lb cheese tortellini
4 tablespoons unsalted butter
2 tablespoons balsamic vinegar
Salt and pepper
1/3 cup walnuts, toasted and chopped
¼ cup fresh grated Parmesan
Bring a large pot of salted water to a boil over high heat. Add tortellini and cook according to package directions, until al dente. Drain.
While pasta cook, cook the butter in medium saucepan over medium heat. Stir occasionally, and continue to cook until the butter turns a golden brown, about 3 minutes. Turn off the heat, and let cool for about 1 minute. Stir in the balsamic vinegar and season with salt and pepper to taste. Add walnuts.
Add tortellini to sauce and toss to coat. Serve immediately with Parmesan sprinkled over the top.