Combine all ingredients, except mushrooms, noodles and garnishes, in a large pot and bring to the boil. Turn to a simmer for 15 minutes. Strain into a large bowl and discard the excess.
Return liquid back to the pan with mushrooms. Simmer covered for a further 15 minutes.
Meanwhile, soak rice noodles in a large bowl of boiling water until soft (about 5 minutes). Divide noodles across 4 bowls. Cover with mushroom stock, and finish with garnishes.
Recipe & Photography by Jade Walker.