Penne with Zucchini Pistou

INGREDIENTS

4 tsp

extra-virgin olive oil, divided

2 1/2 cups

(1/4-inch-thick) slices small zucchini (about 3/4 pound)

1 cup

packed basil leaves

1/2 cup

shaved Parmigiano-Reggiano cheese, divided

2 tbsp

pine nuts, toasted

garlic cloves, chopped

2 cups

chopped Vidalia or other sweet onion (about 1 large)

6 qt

water

1 3/4 tsp

kosher salt, divided

8 oz

uncooked penne pasta

1/4 cup

heavy whipping cream

1/2 tsp

freshly ground black pepper