If your prawns still have the shell on, take it off and de-vein the prawns.
Toss the prawns with half of the chopped parsley and garlic paste. Place into the fridge until it's time to cook them.
For the mango slaw, add the shredded red cabbage, mango matchsticks, sliced sugar snap peas and the rest of the parsley into a mixing bowl. Add the mango chutney along with a drizzle of olive oil and mix well.
Heat some sunflower oil in a pan, when it is hot add the prawns. The pan should be hot enough that they sizzle.
Cook the prawns for about 2 minutes on either side. They should be a nice pink colour. Add the butter and toss to coat.
Plate the prawns over the mango slaw. Spoon over the garlicky butter left over in the pan.