Prepare noodles as directed on packet. Drain, rinse under cold water, then drain well. Roughly cut into shorter lengths with kitchen scissors.
Heat a medium non-stick frying pan over a medium-high heat. Add salmon and cook for 3-4 minutes on each side (or cook in an air fryer at 180 °C for 8-10 minutes), until cooked to your liking. Transfer to a plate. Cool slightly, then break into small flakes.
To make dressing, whisk all ingredients in a small bowl until well combined
​Combine noodles, salmon, carrot, cucumber, shallots and herbs in large bowl. Add half the dressing and toss to coat. Sprinkle with cashews. Drizzle over remaining dressing to serve.