Bring a large pot of water to a boil.
Season with salt and then add soba noodles.
Boil just until they have softened, about 3-5 minutes.
Drain and rinse.
Bring orange juice and chicken stock to a simmer.
Grate in frozen ginger, reserving some for garnish and add soya sauce, green onions, bok choy, sprouts and carrot.
Stir until bok choy is wilted.
Place some soba noodles into soup bowls.
Ladle in some broth and vegetables and garnish with sesame seeds and grated ginger.
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