Cheese Tortellini with Walnut Pesto

Ingredients:
1 cup(s) walnuts
1/3 cup(s) lightly packed flat-leaf parsley with thick stems removed
2 clove(s) garlic, smashed
3 tablespoon(s) grated Parmesan cheese, plus more for serving
1/2 cup(s) olive oil
1/2 teaspoon(s) salt
1/4 teaspoon(s) fresh-ground black pepper
1 pound(s) fresh or frozen cheese tortellini (see Tips below)
1 tablespoon(s) butter


Directions

1. In a food processor or blender, pulse the walnuts, parsley, garlic, Parmesan, oil, salt, and pepper to a coarse puree.

2. In a large pot of boiling, salted water, cook the tortellini until just done, about 4 minutes for fresh and 12 minutes for frozen. Reserve 1/2 cup of the pasta water. Drain the tortellini. Toss with 1/4 cup of the reserved pasta water, the walnut pesto, and the butter. If the pasta seems dry, add more of the reserved pasta water. Sprinkle with additional Parmesan and pass more at the table.

http://www.delish.com/recipefinder/cheese-tortellini-walnut-pesto-recipe-7663