One of the good things about Ryuutaro's traveling was, that he actually had had enough time to gather lots of recipes from every region of Japan. It wasn't like he often got a chance to cook properly, but since he was just so obsessed with his own culture he kept the recipes in his head anyway.
That's how he got to know Sata Andagi in first place - back then when a ship actually agreed to bring him and all his stuff to Okinawa and all. They weren't a proper meal for themselves, but added with some usual Nattodon it'd make for feeding them properly, he supposed.

Also hopefully there was not too much to go wrong with this.
... probably he was just paranoid about Hayato touching anything inside a kitchen. Hopefully.

Ryuutaro silently got everything he might need out, thinking about what he could give Hayato to do. Teamwork, whut is this even?
"Can you whisk this?", he said, pointing to eggs, a bit of water, vanilla flavour as well as some flour.
That should be possible, right? Right.