Cook the soba noodles according to the packet, then rinse under cold water and leave to cool
Cook frozen peas according to the packet, then rinse under cold water and also leave this to cool
Spiralise the courgette or if you don't have one, take a vegetable peeler and peel long strips of courgette so it looks like noodles
Using a vegetable peeler, peel the carrots and then use the peeler to peel long strips of carrot so it also looks like noodles
Slice the red bell pepper and spring onions thinly if using
In a pan, dry roast some sesame seeds on low heat if they are not already roasted, then set aside
Mix the sesame oil, soy sauce, rice vinegar and mirin together in a bowl to form the dressing
Put all your vegetables and noodles together in a large bowl and add the dressing and roasted sesame seeds. Mix well with tongs or your hand.
Taste and add more soy sauce if you want a saltier taste. Add more vinegar if you want more sourness. Add more mirin or sugar if you want it sweeter
Serve the salad cold