If the roses have stems, break them off and discard. Heat the roses with the cinnamon, bay leaves, cumin seeds, coriander seeds, cardamom pods, whole peppercorns, cloves, and chile in a medium skillet over medium-high heat, stirring often, until the cumin becomes brown, 2½ to 3 minutes. Transfer to a spice grinder or coffee mill, add the nutmeg and mace, and grind until powder fine. Store in an airtight container for up to 4 months.
