Yuri was beyond a bit exasperated with her but he was going to be as calm as he could. She clearly didn't know better. He should help her in the most efficient way. Yuri slowly showed her everything that needed to be done before asking her to do so.

"Okay you measure this many teaspoons of the vanilla flavoring."

With that he slowly told her things here and there so she would be able to do them slowly. He didn't make the instructions too forced and if along the way she had questions or uncertainties, she could ask him.

"Good. You're doing great so far."

He reassured her as he pointed to various other things he wanted her to do, "Now mix it together like this. You don't have to apply any pressure just do that."