The special topping is Nagisa, obviously
Figured as much, Hiro mom died when he was about 9yo, with his dad working Nagisa was inviting him for a home cooked meals... the feels...
Quail eggs, that's some fancy ingredient for the rest being pre-made, but you can add pretty much anything you want to a curry... my specialty is a green curry with basil, fresh spinach leaves, green pea, green peppers, jalapeño and egg marinated in dill with brined cucumber slices on the side.
Thanks for the scanlation!