Put the noodles in a large bowl and pour over warm water to cover. Leave to soak for 20 minutes, or until soft, then drain.
Meanwhile, mix the tamarind paste with 2 tbsp hot water and add the sweet chilli sauce, soy sauce and sweetener.
Spray a wok with low-calorie spray and place over a high heat.
Pat the tofu dry using kitchen paper. Fry in batches for 3-4 minutes, or until lightly golden and beginning to crisp.
Remove the pan from the heat and wipe it out with kitchen paper. Spray it with more low calorie cooking spray, add the garlic and shallots and stir fry for 30 seconds. add the chillies and stir fry for 2-3 minutes or until beginning to soften.
Add the noodled to the pan. stir fry for 2 minutes, then push the mixture to one side.
Pour in the eggs and cook, stirring and scrambling, for 2 minutes or until set. Mix into the stir fry.
Add the tamarind mixture and stir well. toss in the spring onions, carrots and tofu and stir fry for 2-3 minutes.
Divide into 4 portions and sprinkle with coriander and lime wedges!