Combine in a medium bowl:
Pour in:
Let stand until the mushrooms and lily buds, if using, are softened, about 20 minutes. Meanwhile, stir together in a small bowl:
Add, turning to coat:
Reserving the soaking liquid, scoop out the mushrooms and lily buds, if using. Slice the mushrooms into strips and cut the lily buds in half, discarding any tough pieces. Line a fine-mesh sieve with a dampened paper towel and strain the liquid through it into a soup pot and add:
Bring to a boil. Add the mushrooms and lily buds, if using, reduce the heat, and simmer for 3 minutes. Meanwhile, stir together in a small bowl:
Add to the soup and simmer, whisking constantly, until slightly thickened. Add the meat along with:
Bring back to a simmer, then stir in:
Remove from the heat and stir in:
Serve garnished with:
Season at the table with: