Trying to find the name of this Dutch show from 1970s

I saw this as a kid in 1979, and it has always stuck with me. It was a show from the Netherlands about two kids solving a mystery, and they had like an adult man helping them out.

One scene I remember is them going to a pickled herring cart on the street and getting pickled herring and just guzzling it right there.

Any ideas what this show was?

Thanks for your help!

could it be Q&Q?
the dutch wiki

I asked my boyfriend (who is Dutch) and he said the same thing.

I realized that I had never responded to the answers here. I think this is it, thanks!

Glad to help

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