Use coconut oil for sautéing the onions, coconut oil imparts a nice aroma to the biryani.
Use fresh ingredients: ginger, garlic, green chili, mint and cilantro.
Fry the onions in the oil used for frying the chicken. Avoid using store bought fried onions.
Sprinkle fresh mint leaves over the rice layer, the aroma of mint makes the biryani taste a whole lot better.
For making homemade fennel powder: Roast the fennel seeds or use roasted fennel seeds and grind to a fine powder. Sieve the powder and store it in an air-tight container.