Heat a large pot to medium heat. Add olive oil, onion, celery, and carrots. Sauté for a few minutes until the onion is softened.
Add chicken broth, water, parmesan cheese rind, and boil.
Add pastina and cook for about 10-15 minutes or until vegetables are completely cooked and soft. Taste and add salt and pepper if needed.
Remove parmesan cheese rind and top with more parmesan cheese and a squeeze of fresh lemon juice (optional). Garnish with fresh parsley and enjoy!
