14th January is when sun enters Capricorn and day starts getting long from here onwards. This day is celebrated in India and different states have different celebrations. In Gujarat where I grew up, people fly kites, eat sesame/peanut brittles , Undhiyu.
I like to bake and so I make baked Undhiyu. Tarla Dalal who was and is popular Gujarati chef has nice Undhiyu recipe on you tube. It’s using pressure cooker.