Peel and mince shallots and garlic. Rinse spinach, drain well and coarsely chop.
Process pork through a meat grinder. Combine pork, egg, spinach, 2-3 pinches of allspice, salt and pepper.
Heat oil in a pan and cook pork for 2-3 minutes, then remove from heat and let cool.
Thinly roll out dough on a floured work surface. Cut out 4 disks of dough, about 12 cm (approximately 4 3/4 inches) in diameter each.
Preheat oven to 180°C (approximately 350°F).
Top 2 pieces of dough with pork mixture. brush edges with water and top with remaining dough. Press well and brush with egg yolk whisked with a little water.
Place dough onto a baking sheet lined with parchment paper. Bake for 20-25 minutes. Remove from oven, let rest briefly and serve warm.