Place the chopped sausages in a pot. Pour in the broth. Bring to the boil then lower the heat, cover and simmer for about ten minutes. You’ll be amazed at how the flavor of the broth will be improved after simmering the sausages.
Add the tofu and the mushrooms. Simmer for another ten minutes. Taste the broth, you will likely need to add fish sauce since the mushrooms and tofu will absorb much of the salt in the broth.
And that’s it. To serve, simply top the soup with scallions and cilantro. Add a poached egg, if you like.