I have a question about the recipe "Hyderabadi Chicken Biriyani" from nykavi. How many onions? Any particular type of onion?
You can always send a message to the recipe author.
Failing that or in a rush?
For similar recipes serving 4, I would start with 1 large onion (any kind), minced and adjust up or down depending on how it looks or taste preference of your eaters.