Thaw the spinach, squeeze it out well and chop it very finely. Finely mash the ricotta with a fork. Fold in the spinach, 100g parmesan, eggs, egg yolk and flour. Season with salt, pepper and nutmeg. Shape long dumplings with two moistened teaspoons and place on a floured board. Put the dumplings in boiling salted water and let stand for about 5 minutes. Lift the dumplings out of the water (let them drain well!), Place on a plate, pour slightly browned butter over them and sprinkle with the rest of the freshly grated Parmesan.