Peel some fine shavings from the Parmesan cheese with the peeler. Coarsely grate the rest of the Parmesan. Peel the garlic. Chop garlic and pistachios coarsely. Wash the parsley and pluck it, except for a little bit for garnishing.
Finely puree parsley, garlic, pistachios, grated parmesan and oil in the universal chopper or with the chopping stick. Season to taste with salt and pepper
Cook the pasta in plenty of boiling salted water for about 8 minutes. Drain and serve immediately with the pesto. Garnish with parmesan shavings and the remaining parsley