Place toasted walnuts, garlic, rocket and parsley in food processor and blitz for about 30 seconds until finely chopped.
Add avocado or Parmesan, extra virgin olive oil and Udos Choice Oil. Continue to blitz slowly to bind the sauce (approx. 30 seconds). You should have a slightly runny consistency.
Season with salt and cracked pepper and transfer to a clean kilner jar. Cover the top with a thin layer of olive oil to prevent oxidation.