If the shrimp were frozen, you need to thaw them thoroughly beforehand and warm to room temperature. Mix all dressing ingredients in a bowl. Mix shrimp with grated ginger and fish sauce.
Heat 1 teaspoon of oil in a small pan and add shrimp, fry for about 1-2 minutes, depending on whether the shrimp were raw or pre-cooked. Remove from pan and transfer to a salad bowl.
Add pomelo pieces peeled of membranes, grated carrot and mung bean sprouts. Pour over dressing, mix and serve.