If you are reading in order to learn how to write, be sure to pick books that have been professionally edited. Read cookbooks, and choose well.
Observe the introductory chapters – are they useful, interesting? Note the style in which recipes are written. Headnotes may explain the origin of a recipe or relate an anecdote about it or provide cooking tips. Sidebars and footnotes can provide additional information about ingredients or technique.
Observe language, style, a writer’s formality or casual way of presenting information. Learn vocabulary – look up terms you don’t know. All that reading will lead to the next step toward your goal – writing.