Hi Amanda. The curd based side dish that goes with the Biryani is called 'Raitha' and the Chilli curry is called 'Mirch Ka Salan'. I have posted both the recipes in this website. Here are the links.
http://www.ifood.tv/recipe/raita_1
http://www.ifood.tv/recipe/mirch_ka_salan
Snigdha says :