Jain context note: I’m not entirely sure what you mean by “athai.” If you’re asking about breaking a Jain vrata or upvas with a parna (parana), here is the common guidance across Jain traditions:

• Start softly: break the fast with something simple and sattvik, such as a piece of fruit (banana, dates) or a small glass of milk. Many people prefer warm milk or a light fruit.
• Then proceed to a light, root-vegetable–free meal: examples include khichdi (rice with dal) made without onion, garlic, or root vegetables; or plain rice with boiled vegetables that are not root tubers. Avoid strongly spiced, heavy, or fried foods.
• In Digambar and Shwetambar practices, the emphasis is on non-violence and simple food. Both traditions generally avoid meat and root vegetables during vrat-related meals; the exact allowed vegetables can vary by local custom, so you may follow your family or temple practice.
• After the initial break, you can have a fuller, regular meal later in the day, still keeping to light, non-stimulating foods and avoiding onion/garlic if that is your observance.

If you can share more about which vrata or occasion you mean (for example, a specific fast like Paryushan, a weekly upvas, or another observance), I can tailor the guidance more precisely to that context.