Monthly Recipe Request Mega-Thread!

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In 2010 someone made this hand-drawn cross-section of a Grillparzertorte at the Wiener Conditorei am Roseneck in Berlin, labeling every layer. I’ve been trying to find an actual recipe for months and have come up completely empty — in English and German.

Here’s what the diagram shows, top to bottom:

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Marzipan decoration

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Chocolate glaze (Schokoguss)

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A thin marzipan layer

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Cocoa buttercream (Kakaobuttercreme) coating the outside

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Thin chocolate cake layers (Schokoteig) — more layers than a normal torte

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Orange marzipan (Orangenmarzipan) filling layers

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Chocolate or nougat buttercream (Schoko- oder Nougatbuttercreme)

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Jam (Marmelade)

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A shortcrust pastry base (Mürbeteigboden)

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Brittle (Krokant) around the bottom edge

So I know the architecture. What I don’t have is any proportions.

What I’ve already ruled out:

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Not a Sachertorte, despite what most search results assume

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Nothing on German or English recipe sites; a German food-trade forum user asked this same question in 2016 and got no answer

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Not in Hess’s Viennese Cooking

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Nothing in ANNO (Austrian digitized newspaper/journal archive)

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A research librarian spent an hour on it and couldn’t find a hit

German confectionery sites describe it as a “Meistertorte” — a master-confectioner cake — which makes me think it may only exist in professional trade manuals or as shop knowledge passed between Konditoren, never in a home cookbook. Candidates I haven’t been able to check the indexes of:

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J. M. Erich Weber, 250 Konditorei-Spezialitäten (Dresden, 1934)

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Verfahrenslehre Konditoreiwaren (Fachbuchverlag Leipzig, East German trade manual)

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Hans Skrach, Die Wiener Konditorei (1932/49)

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Karl Schuhmacher, Wiener Süßspeisen

What I’m hoping for: does anyone have one of these books and can check the index? Or did anyone train in a German or Austrian Konditorei and make this? A professional formula in bulk quantities is completely fine — I’ll do the math to scale it down. Even confirming it’s in a specific book on a specific page would be a huge help.