Mix hot water with tom yum paste.
Heat pan on med heat with 2 tbsp oil.
Pan fry prawns until nearly cooked, set aside.
In the same pan, heat up the other 2 tbsp oil.
Add cooked pasta, straw mushrooms, tom yum mixture and mix well.
Add in prawns and cherry tomatoes, stir-fry for a min.
Turn off heat.
Toss in basil leaves.
Garnish with parsley and lime wedges.
Serve!