Soup from everything there is

Ingredients:

• 2 tbsp extra-virgin olive oil + extra for drizzling
• 1 small onion, diced (about 1 cup)
• 1 medium carrot, thinly sliced ​​(about 1/2 cup)
• 1 medium stalk celery, thinly sliced ​​(about 3/4 cup)
• 5 cups of water, lightly salted chicken broth, or a mixture of both
• 1 Parmesan rind (optional)
• 1 ear of corn, cut off the kernels, keep the cob (optional)
• 1 small zucchini, coarsely grated (about 1 1/2 cups)
• 1 cup chopped green beans (bite-sized)
• 1 cup cold cooked rice, pasta or cereal
• 2 cups thinly sliced ​​romaine lettuce or spinach
• 2 tbsp. l. chopped parsley
• Grated Parmesan and/or freshly squeezed lemon juice, to serve

Preparation:

1. Heat olive oil in a large saucepan over medium heat. Add the onion, carrot, celery, 1/2 teaspoon salt, and 1/4 teaspoon black pepper and cook, stirring occasionally, until the vegetables are softened and the onion is translucent, about 8 minutes.
2. Add water and/or broth, Parmesan rind, and corn on the cob (if using). Bring to a boil, then reduce heat and simmer until the carrots are very tender, about 10 minutes.
3. Add the corn kernels, zucchini, and green beans and cook until all vegetables are tender and fragrant, about 10 minutes more. Discard the Parmesan rind and corn on the cob.
4. Add the rice and simmer for another 2 minutes, then add the herbs. Turn off the heat as soon as the leaves begin to wilt. Taste the soup and season with salt and pepper if needed. Ladle the soup into bowls and garnish with Parmesan cheese and/or lemon juice.
   
   
   Note
   This is an example of a soup that can be customized using almost anything you have in your fridge.
5. Basic Soup Formula:
   2 cups of aromatic base (onion, carrot and celery)
   5 cups liquid (water, broth, or liquid from cooking something)
   3 cups mixed vegetables (e.g. potatoes, zucchini, pumpkin, cabbage), cut into bite-sized pieces
   1 cup cooked grains (rice, pasta, quinoa or barley)
   2 cups thin salad greens (lettuce, spinach, or watercress)
   2 tbsp. l. chopped fresh herbs (parsley, cilantro or dill)