Juline's Rockin' Recipe of the Day - Fettucine with Walnuts and Parsley

12 ounces (3/4 box) whole-wheat fettuccine

2/3 cup chopped toasted walnuts, 2 tablespoons reserved for garnish

1/4 cup olive oil

5 cloves garlic, minced

1/2 cup low-sodium chicken stock

1/2 cup chopped parsley leaves, plus more for garnish

1/2 teaspoon salt

1/2 teaspoon fresh ground black pepper

1 ounce grated Parmesan (about 3/4 cup)

2 cups arugula leaves, gently packed