A wholesome, deeply comforting soup crafted from slow-simmered stock, aromatic garden vegetables, and fresh herbs, served with crusty bread.
Simmer the stock with the tomatoes and garlic for 10 minutes.
Add the tofu cubes and simmer for 5 minutes.
Stir in the black vinegar, chili oil, and salt.
Scatter with the spring onions.
Ladle the hot sour soup into bowls.