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Google announced yesterday on Twitter that the rich results test can now show you how your recipe mark up looks not just in Google Search but also on Google Home devices and smart displays. Here is a screen shot from Google showing this in action.
You can see in the footer of this image that it shows a "preview in" and you can select Google Home Hub.
You can try this yourself by trying this test URL and clicking on "Assistant Recipe Guidance Overview." Here is a screen shot of that result:
Forum discussion at Twitter.
