Japanese broth with udon noodles recipe

Ingredients

• dried udon noodles
• litres vegetable or beef stock
• cm piece of fresh root ginger, sliced into thin slivers
• sachet miso instant soup paste
• fish sauce or soy sauce, to taste
• red chilli, deseeded and thinly sliced
• large clove garlic, thinly sliced, optional
• mixed mushrooms — button, shiitake, oyster, thinly sliced or torn into bite-size
• mangetout, cut into fine strips
• finely sliced fillet steak
• spring onions, trimmed and shredded, optional
• Lime wedges, to serve