Soak the cashew nuts in boiling water for 10 minutes. Meanwhile, cook the pasta to package instructions.
Using a hand blender, mix all the other ingredients together (drain the cashews). Preheat the grill. (Add the yeast 1 tbsp at a time and add until it is to your taste. This can be a strong flavour if you're not used to it- https://www.buywholefoodsonline.com/brewers-yeast-1kg.html)
Mix the pasta with the sauce and place in an ovenproof dish. Grate some vegan cheese over the top and sprinkle with fresh parsley. Place until the grill to melt the cheese and allow it to go crispy.