Prepare the ingredients for the soup.
Dice the celery stalks, onion, and carrot.
70 g onion, 100 g carrot, 100 g celery
For the soup, choose a pot with a thick bottom, pour in the olive oil. Heat the oil and add the diced vegetable mixture. Sauté until the onions and celery are translucent, about 10 minutes.
60 g vegetable oil
Add peeled and hand-crushed canned tomatoes, tomato paste, lentils washed in several waters (brown, red, or green), oregano, and a rind of parmesan. Mix everything.
200 g lentils, ½ tsp oregano, 40 g tomato paste, 50 g parmesan, 120 g canned tomatoes
Add water and salt, mix again.
⅓ tbsp salt, 1 liter water
Cook the soup until the lentils are done. In this case, it's 40 minutes.
Turn off the heat, add fresh young spinach leaves to the soup.
50 g spinach
Taste the finished soup. If necessary, add salt, pepper. Serve the dish sprinkled with finely grated cheese and with a few pieces of dried bread.
⅓ tbsp black pepper