It's a specific historical thing that spread past the estate that invented it after it got popular, so it's a little different.....

[The small cakes he describes lean as much torte as gateau--spongey layers of cake soaked in Lum berry liqeur, filled with Lum berry jam and rich pastry cream, with a slick, shiny icing glaze holding it all together. As decadent as they sound, apparently people swear by them as a restorative--that all you really need is a good cup of tea and a cake or two, and you'll be shaking off foul moods, illness, exhaustion, and even minor injuries in a matter of hours.

The other things he describes, on the other hand, are probably much more in line with the kind of traditional treats Taako knows. Sweet filled galettes, sablés, macarons, elegant fruit tarts full of more berries he's likely also never heard of.....]