Place the cashews and chopped garlic in a bowl. Pour over the boiling water and set aside for 5 minutes to soften the cashews.
Add the roasted red capsicum and sun-dried tomatoes to the bowl with the cashews and garlic. Use a hand blender or transfer to a food processor to blend until smooth.
Stir the chopped basil into the sauce and season with black pepper to taste.
Bring a large pot of water to a rapid boil. Add a pinch of salt to the pot, then the fusilli. Stir once, then boil for 8 minutes, or according to the package instructions, until the pasta is al dente.
Drain the pasta and transfer it to a large bowl. Pour the prepared sauce over the pasta and mix well to combine.
Divide the pasta between 2 bowls and top each with a handful of rocket.