Sausage Tortellini Soup

Bahan-bahan (6 porsi)

• ½ pound Italian sausage (hot or mild)
• 1 medium onion (diced)
• 1 cup water
• 1 ½ teaspoons cornstarch
• 4 cups reduced sodium beef broth
• 14 ounces canned diced tomatoes (with juices)
• ¼ teaspoon dried basil
• ¼ teaspoon dried oregano
• 9 ounces refrigerated cheese tortellini (about 2.5 to 3 cups uncooked)
• 1 medium zucchini (sliced)
• shredded Parmesan cheese (for serving)
• chopped fresh parsley (for serving)