Soak the glass noodles in room temperature water for 5 minutes or until softened slightly.
For the dressing, pound garlic, chilli and coriander stems using a mortar and pestle, then add the brown sugar, fish sauce and lime juice. Stir to combine. Set aside until needed.
Cook soaked noodles in boiling water for 2 minutes and cook through. Remove noodles from the water and place in a large bowl of cool water.
Pour out the cooking water, leaving just enough to cover the bottom and bring to a boil. Add the pork and one teaspoon of fish sauce and stir until fully cooked. Remove the pork and let it cool on a plate.
Drain the noodles thoroughly.
In a large serving dish, add the drained noodles, carrot, shallots, celery, pork and salad dressing. Toss thoroughly then add the prawns, coriander leaves, chilli and cashews. Toss everything once more so all the prawns are coated in salad dressing.
