I saw a pic of it on instagram that also showed it had the correct spine from the movie (although the logo at the bottom was unclear), but couldn't find one of the back cover of the journal so I don't know if that's correct. Here are some screenshots from the movie:
And of a Hallmark christmas ornament showing the back cover a bit more:
The text on the back seems to be (thanks in part to Mitch at Pixar Planet • View topic - Ratatouille Toys!):
Friendly and enthusiastic, 'Anyone Can Cook'
is the essential culinary reference for both
the novice and the professional cook. Writen
by Auguste Gusteau, owner and chef of the
world-renowned Paris restaurant, Gusteau's,
this book brilliantly relays his experience in
gourmet kitchens as well as humble tech-
niques learned from his mother and grand-
mother. With each dish Gusteau prepares, he
always remembers his first rule of cooking
the best cuisine is made for friends.
"If you're one who can burn water, I highly
recommend 'Anyone Can Cook'. You'll learn
how simple it is to prepare great meals sure
to impress your family and friends."
- Brad Lewis
Auguste Gusteau is the owner and chef of
Gusteau's in Paris. Gusteau's is world-
renowned for superior tradtional French
cuisine and a friendly neighborhood atmo-
Here is a page from the Ratatouille cookbook containing one of the illustrations on the back cover (I can't find the other):
Here are my versions of the spine and back cover. I'm no good at recreating illustrations so someone can do them better probably. Here are the scans of the notebook I used if anyone else wants to have a try. The font for the back cover text is Typography of Coop Light.