Eighteen chapters across four parts that build from theory into practice. Part one explains what Linzer dough actually is, why it's built on a ratio of three parts flour, two parts butter, and one part sugar, and what happens when you shift that balance. Part two gets into the mechanics — the role gluten plays, why temperature is your most important tool, and why baking soda and baking powder have no place in Linzer dough.

Part three is pure hands-on practice: a shopping list with the reasoning behind each item, the full method step by step, a chapter on rolling pins and rolling technique, baking, filling, sandwiching the cookies together, and finally storing and letting them mature. Part four adds a troubleshooting chart, cocoa dough and other variations, modern versions that actually make sense, and ten key takeaways to remember even if you read nothing else.

The single most useful page in the whole book. It covers the most common problems you'll run into with Linzer dough — from dough sticking to the rolling pin, to rounds cracking as you transfer them to the baking sheet, to cookies that still haven't softened after a week — with the cause and the fix for each one. It's the page you'll want to print out and stick on the inside of your cupboard door.

Nearly fifty pages in PDF format, made for reading on your phone, tablet, or computer, and just as easy to print. It's a digital product, so there's no shipping fee and nothing gets mailed — you download it yourself. The seven recipes in the Yumsto app open via a link or QR code straight from the book. The guide covers classic Linzer cookies, cocoa and hazelnut variations, the original Austrian recipe from 1653, gluten-free and vegan versions, and Christmas cookies in general — from choosing your flour and butter to storing the finished cookies.