Linguine with Grilled Shrimp and Arugula-Parsley Pesto

INGREDIENTS

1 1/2 lb

Shrimp, medium or large

1 cup

Arugula, packed leaves

2 cloves

Garlic

1 cup

Parsley, packed leaves

1 lb

Linguine or spaghetti, dried whole-wheat

1/4 tsp

Black pepper, ground

1/2 tsp

Sea salt, fine

6 tbsp

Olive oil, extra-virgin

1/4 cup

Walnuts, toasted

2 tbsp

Parmigiano reggiano cheese, grated

2 tbsp

Ricotta cheese, part-skim