Almeirim's folkloric legend made vegetarian: a hearty stew of red beans, savoy cabbage, potatoes, carrots, and turnips simmered with garlic, paprika, and a clean river stone.
Place the scrubbed river stone in the bottom of a large soup pot with olive oil. Add chopped onion, garlic, bay leaf, and pimentão doce, cooking for 6 minutes until aromatic.
Pour in vegetable stock. Add diced potatoes, carrots, and turnip. Simmer for 15 minutes.
Add shredded cabbage and cooked red kidney beans (mashing a few beans to thicken the broth). Simmer for 20 minutes until deeply flavorful and rich.
Stir in fresh chopped coriander. Ladle steaming soup into deep bowls, leaving the folkloric stone in the pot.