I don't recall seeing it in the possessive/genitive case like that. Any bakeries I go to have it as 'German Chocolate Cake' even google will autocorrect "germa

I don't recall seeing it in the possessive/genitive case like that. Any bakeries I go to have it as 'German Chocolate Cake' even google will autocorrect "german's choco... to german choco... Just like hardly anyone says "baked Alaska-Florida cake".