Image don’t show on google

Can you give me a link to a recipe that doesn’t show?

I don’t see any problems with the recipe metadata:
https://search.google.com/structured-data/testing-tool/u/0/?hl=en#url=https%3A%2F%2Fstinna.dk%2Fsalat%2Fspidskaalssalat-med-hvidloegsdressing-aeble-og-ristede-mandler.html

So Google has everything they need to display the rich snippet. They still decide for themselves wether or not to do that, which depends on other factors as well.

Are you using an SEO plugin like Yoast SEO as well?

Yes it is. We recommend Yoast.

I do notice that there’s a lot of other metadata on the page. When using Yoast in combination with our plugin it should basically only be that recipe metadata (with the rest of the schema graph below).

That other metadata could be coming from your theme, so you might want to check that.

You can see that in the Structured Data Testing Tool I linked to before:
https://search.google.com/structured-data/testing-tool/u/0/?hl=en#url=https%3A%2F%2Fstinna.dk%2Fsalat%2Fspidskaalssalat-med-hvidloegsdressing-aeble-og-ristede-mandler.html

Only the “Recipe” part is coming from our plugin.