To your food processor or blender add the capers, garlic and walnuts.
Pulse until finely chopped.
Add in the tomato paste, Calabrian chili paste, sun-dried tomatoes, red peppers and salt.
Pulse until well combined.
With the machine running drizzle in the olive oil.
Blend until well combined but still has some texture.
Add in 1/2 cup finely grated Parmesan.
Mix to combine.
Cook the pasta in well salted water.
Drain and reserve some of the pasta water.
Toss the pasta with about 1/2 cup each pesto and pasta water. Mix well, adding more water and/or pesto according to your taste.
Serve with more parmesan and fresh basil.