While the beef is cooking, mix the following together in a bowl: yogurt, coriander powder, red chili powder, turmeric, paprika, black pepper, nutmeg, mace, salt, green cardamoms, cloves, black cardamoms, cinnamon, bay leaf, and star anise.
In a large vessel, spread out half of the boiled rice, followed by the beef and potato mixture (masala). Cover with remaining rice. Sprinkle a pinch of food color, if desired. Sprinkle prepared fried onions. Cover and seal the vessel with a cotton tea towel or aluminum foil, followed by the lid. Cook over low heat until the rice has finished cooking, about 45 to 60 minutes.
Measurements are in actual measuring spoons/cups and not eating utensils.
The chillies I use are very spicy. Feel free to increase the red chili powder or green chilies if your chilies are more mild.
Instructions for steaming the biryani in the oven: Layer the rice and beef mixture in a large oven-safe pan as instructed above. Seal the pan well with aluminum foil and bake at 350°F for 45 minutes to 1 hour.