Step 1

In a large pot cook leeks, celery, carrots, and garlic over medium 5 minutes, stirring occasionally and adding water, 1 to 2 Tbsp. at a time, as needed to prevent sticking. Add the next seven ingredients (through crushed red pepper, if using). Bring to boiling; reduce heat. Cover and simmer 20 minutes or until vegetables are very tender.

Step 2

Season to taste with red wine vinegar. Sprinkle with parsley.