A sheep rides a tsunami in classic Western style. And by Western style I mean the sheep is dressed in a cowboy outfit and has put a saddle atop the tsunami wave to ride it. It’s a tsunami rodeo and this crazy sheep is riding that tsunami wave in classic Western style.
This kanji also means ocean, because presumably the people from the "West" who have "Western Style" came from across the ocean. They're the "Ocean People" in this sense. You'll want to be familiar with this meaning for vocab later on.
After a whole day of riding this tsunami, the sheep is hankerin’ for some Western style food. This sheep loves yogurt (よう). And its favorite flavor is Western style apple pie yogurt. America loves its apple pie and this sheep loves Western style apple pie flavored yogurt.