Use our choose-your-own-adventure formula to make a big batch of soup starring any vegetables you please. Use vegetable broth or water to make it vegetarian, and omit the Parmesan to make it vegan. Check out our step-by-step guide.
In a large pot, heat oil over medium-high. Add onion, garlic, carrot, and celery. Season with salt and cook, stirring, until onion is translucent, about 3 minutes.
Stir in oregano or thyme and/or tomato paste or Parmesan rind.
Stir in hard, starchy vegetables and broth. Bring to a boil, then reduce to a simmer and cook 5 minutes.
Stir in quick-cooking vegetables. Return to a boil, then reduce to a simmer and cook 5 minutes more.
Stir in rice and greens. Heat through. Adjust seasoning with salt as desired.
Ladle soup into bowls. Drizzle with oil; sprinkle with Parmesan and herbs. Serve with crostini.
If using frozen quick-cooking vegetables, such as peas or corn, add in step 6.