Pumpkin Gnocchi with Walnut Pesto

Name: Pumpkin Gnocchi with Walnut Pesto
Ingredients: For the walnut pesto:; 3 1/2 ounces (100 grams) walnuts, plus a few for the topping; 3 tablespoons chopped parsley; 1/2 cup (110 millilters) olive oil; Salt, to taste; Pepper, to taste; For the pumpkin gnocchi:; 21 ounces (600 grams) pumpkin, cut into 1-inch (2 1/2-centimeter) cubes; 7 ounces (200 gram) potatoes, cut into 1-inch (2 1/2-centimeter) cubes; 2 egg yolks; 2 tablespoons butter; 10 ounces (280 grams) plain flour; 3 teaspoons (leveled) salt; Grated nutmeg, to taste