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And of course using existing microformats as building blocks when appropriate.
The obvious path forward is to use h-product for menu items. h-product offers pretty much everything a menu item microformat needs: p-name for the item name, (e.g. mushroom soup), u-photo, e-description, and p-price. There are some additional things in menus, notably calories, that might require a new property. If a menu has a page for individual items, u-url is available. h-review might be useful for review sites like Yelp or Google (though that might be a disincentive for restaurants, which tend to harbor strong antipathy to review sites in general and Yelp in particular. I'm not sure if p-category can be reused, but some way to tag items -- as vegetarian, gluten-free, etc. -- would be useful. Btrem (talk) 02:12, 4 December 2020 (UTC)
... feel free to add more unstructured thoughts there.