Once he's made every recipe in the book

"Alright, Xavier," she told him, "You can move on once you've made every recipe in this book once, okay?"

"Every one?!" he asked, "But that'll take me forever!"

"It might take a while," she admitted, "But you'll be having a new recipe every day. There's nothing wrong with the beginner recipes, you just like the idea of being able to make something more complicated."

He nodded, and Dr. Vierre hoped he understood her point. She talked with him a little longer about his new hobby and his relationships, and then he went home.

It was only a few days later though, when sitting at his computer, that he actually googled "Cooking Guides for New Brides" and after scrolling a while, found them.

There were three more volumes, Intermediate, Advanced, and ****. He didn't want to bite off more than he could chew, but the "****" one sounded very cool.