Toast the walnuts at 325°F/163°C until very lightly browned, 5 to 10 minutes. Chop the walnuts finely and combine with the sugar, cinnamon, cardamom, and cloves; set aside.
Layer 8 sheets of phyllo pastry onto a half sheet pan (13 by 18 in/33 by 46 cm), brushing melted butter between each layer. Sprinkle on