My friend Noora who is from Kozhikode makes excellent malabar biriyani. Following is the copy paste of the recipe she gave me. Though the preparation is time consuming the final results are very much worth the effort.
For marinating Chicken(full chicken cut into medium size pieces)
1. In a vessel add 3 sliced onions,3 chopped tomatoes, 1 sprig curry leaves,20 chopped green chillies,6 cloves of garlic chopped,3 cm ginger chopped, coriander leaves and mint leaves.Mix thoroughly with hand.