Mix Dressing in a jug or small bowl. Use water to adjust consistency (it should be pretty thick and gloopy), Sriracha for spiciness and saltiness with salt (not more soy sauce).
Place all Salad ingredients in a bowl, reserving some noodles, peanuts and shallots for topping. Drizzled with Dressing and toss. Garnish with remaining noodles, peanuts and shallots and serve immediately.
