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why don't you google? It comes up referenced in the nyt piece. It's not a tart---google cake and you will easily get the recipe.
Hi Gabriella, it's actually not easy to find through Google but I was able to track it down through the NYT's search, and here you go:http://www.nytimes.com... Hope this is helpful!
google "Marcella hazan's recipe for walnut cake" and it comes right up. It sounds good!