This impressive dish does require a little extra effort that a normal curry but all it needs to go with it is a simple raita and if you can then a green or salad on the side but anything more would detract from the biryani. I like to use a few different types of mushroom so that there are different textures as well as flavours, choose those you like and if your budget allows, buy a few wild, special mushrooms, if not stick to shiitake, oyster and large chestnut mushrooms. Balance the flavour of your sauce using the cream or tomato puree and season knowing that the rice is barely seasoned.