My favorite food is Bbiryani. My favorite food is biryani.

In general, you only need to capitalise a noun if it is a proper noun - the official name of a specific person, place, or thing. Here is a link for more info: https://www.grammarly.com/blog/punctuation-capitalization/capitalization-rules/ For food specifically, capitalise brand names but not dishes. For example, capitalise Vegemite, Toblerone, Snicker's, but NOT curry, sandwich, salad, pie, soup, biryani, kebab, etc.

We marinate the chicken in the yogurt with spices like salt, red chilli, tumeric, ginger garlic paste, cinnamon, cloves, cardamom, black pepper, cumin, coriander, nutmeg, fired onion, green chilli paste, fresh coriander and mint at least for two hours. We marinate the chicken in the yogurt with spices like salt, red chilli, tumeric, ginger garlic paste, cinnamon, cloves, cardamom, black pepper, cumin, coriander, nutmeg, fired onion, green chilli paste, fresh coriander and mint at least for two hours.

In the sauce pan , we saute onions and then add marinated chicken and cook it for some times. In the sauce pan , we saute onions and then add marinated chicken and cook it for some time.

Sometimes = from time to time, not every time/not always, every now and then Some time = an unspecified amount of time

When it is done we placed it at the side. When it is done we place it at the side.

In another sauce pan we boil rice by, and adding whole black paper, cumins, coriander and mint and a little vinegar. In another sauce pan we boil rice, and add whole black paper, cumins, coriander and mint and a little vinegar.

Adding the spices does not directly result in the rice boiling, so using "by adding" here wouldn't make sense.

Then we layer onthe gravy layer and rice. Then we layer the gravy and rice.

People like to add some food colour but I don't . People like to add some food colour but I don't .

Food colouring? Or foods to add colour (eg. sprinkling mint on top to add some green)?