A regular side dish made with biryani...
1.Add any vegetables to make the raita colorful such as grated carrots or cucumber or any vegetable or fruit that goes well it.
2.But to keep it simple adding onions is a good option. Add as much amount of chopped onions as per your requirement.
3.If one is not willing to make a paste then, just add finely chopped coriander leaves, mint leaves, green chillies.