Wash the vegetables well and dry them thoroughly.
Mix all the other spices except the onions and marinate the vegetables in it for an hour.
Now, when the vegetables marinate in the spices, fry the onions in ghee till they are brown.
Once done, remove it from the ghee.
When it is cool, grind it into a paste.
Cook the rice in double the amount of water.
When it is cooked, spread it in a plate and wait till it is cool.
For the rice First roast the saffron mildly, grind it into a powder and then spread it over the rice.
Next, take a kadhai, put the ghee in it and heat.
Also, season it with the whole spices.
To this add the vegetables and saute for say, 5 minutes.
Then add 1 cup water and cook the vegetables, onion paste till they are done and become almost dry.
Next, take a baking dish.
Place the rice and the vegetables in alternate layers in the baking dish, first to make sure that your biryani doesn't only look good but tastes good as well, garnish the top layer and then bake it in a moderately hot oven for 20 minutes.