Great question — answering as the UphillTech team:
These might have been Grantham Gingerbread . This is one of England's oldest biscuit (Americans would call it a cookie) recipes, first recorded in the 1700's. These are a plain sugar biscuit, usually flavoured with ginger, but you can leave this out and/or flavour with other spices. The biscuit/cookie that rises during cooking to produce a firm shell and hollow inside. They are usually not completely hollow, just mostly hollow with some pillars of batter supporting the roof. A good recipe that I have been using is from the BBC , but pretty much all the recipes on-line are the same, with minor variations. They are made with only a few ingredients and are quite easy to make. Edited to add:...
Full answer by bob1: https://cooking.stackexchange.com/a/124264 (CC BY-SA 4.0).
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