Cooky Booky
Your cookbooks, offline, in your pocket.
This one is private, so here are some screenshots instead of a link.
Cooky Booky is an offline recipe app for iOS and Android. You import EPUB cookbooks and it pulls out every recipe with its photo, ingredients, steps, tips and nutrition, then stores it all in a local database on the phone.
Nothing is fetched from the internet at runtime. Even the fonts are bundled. Favourites, a grocery list and a random-recipe dice are built in.