Refrigerator for 30 minutes to marinate.
Heat 1 tbsp oil in a pan and add the cinnamon, cloves, chiles, poppy seeds, mace, cumin, peppercorns, fennel, star anise, coriander, bay leaf, nutmeg, and sliced onions and sauté for 5 to 7 minutes more or until the onion is browned.