The Kobo ePub renderer has never had the ability to zoom pictures. Frankly I for one don't see it as a big deal.
As others besides me have said in the past, the majority of images in an ePub have been compressed and do not have a great deal of detail that would be seen any clearer when zoomed in.
Of course, Cookbooks tend to have gigantic colour pictures of finished goods; how they expect those to show well on a grey scale device I don't know.
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