II
The Method
1
Combine the rye flour and wheat flour on a work surface. Make a well, add the eggs and cold water, and work to a smooth, firm dough. The rye component makes the dough slightly stiffer than an all-wheat pasta dough; knead for 8–10 minutes until it is cohesive and no longer sticky. Wrap and rest at room temperature for 30 minutes. The dough is ready when it yields slightly to a pressed thumb without springing back.
2
Combine the drained ricotta, chopped spinach, grated Parmigiano, egg, nutmeg, and salt in a bowl. Mix until uniform. The filling must be dense enough to hold its shape on a spoon — if it runs or spreads freely the pasta will break during boiling. If in doubt, return the ricotta to the sieve for a further hour.
3
Roll the rested dough to 2 mm thickness — thin enough that the dark mass of filling is faintly visible through the sheet. Cut into circles of 10 cm diameter. Place one level tablespoon of filling at the centre of each circle. Fold to a half-moon, aligning the edges precisely, and press firmly around the border to expel any air and seal completely. This is where the dish lives or dies: a loose or air-filled seal will open during boiling, spilling the filling into the water.
4
Bring a large pot of water to a rolling boil and salt it heavily. Lower the schlutzkrapfen in batches. Boil for 4–5 minutes, testing at 4 minutes: rye pasta softens faster than wheat, and over-boiling makes the dough collapse. The pasta is done when it floats and yields easily to a gentle bite through the seam with no raw, floury resistance.
5
While the pasta boils, melt the butter in a wide pan over medium heat and continue cooking, swirling, until the milk solids turn a deep hazelnut-brown and the butter smells of toasted nuts — burro nocciola. Remove from the heat immediately. The colour must be brown, not golden; golden butter lacks the Maillard-developed nuttiness that the dish requires.
6
Lift the schlutzkrapfen directly from the boiling water with a slotted spoon and transfer to the pan of brown butter. Turn gently to coat. Plate, scatter with grated Parmigiano and freshly cut chives, and serve at once.