Penne with Summer Squash

Ingredients

• dry penne pasta

  preferably whole-wheat
  1 lb
• olive oil

  preferably extra-virgin
  ¼ cup
• cloves garlic

  minced
  3 medium
• shallots

  finely chopped
  2 large
• zucchini (1 lb)

  very thinly sliced
  4 small
• small pattypan squash

  quartered (2 cups)
  8 oz
• finely grated lemon peel
  1½ tsp
• salt
  ½ tsp
• freshly ground pepper
  ½ tsp
• finely shredded fresh basil
  ½ cup
• chopped fresh chives
  ⅓ cup
• shaved fresh Parmesan cheese (optional)
  ½ cup