Halve the sugar snaps and button mushrooms, peel and finely slice the garlic, and peel and finely grate the ginger. Dilute the miso in a pan as per packet instructions. Bring to a simmer and add the broccoli, sugar snaps and mushrooms, and cook until the broccoli has softened. Add the spinach, garlic, ginger and noodles until the noodles soften, then pick over the coriander leaves.