Question

 شیرینی دادن به انگلیسی چی میشه؟ تو فردا باید شیرینی بدی واسه ماشینی که خریدی.

Answer 1

treat someone to something

You must treat everybody tomorrow for the new car that you bought

Answer 2

I rewarded her with a celebratory family dinner at the restaurant of her choice

https://www.collinsdictionary.com/dictionary/english/celebratory

 

Take your employees out for dinner on the house

https://www.snacknation.com/blog/ways-to-reward-employees/