Poor mouse, always the worse for wear. He really should drink some more tea to get over that wicked hangover. The Hatter throws such epic parties, no wonder he's not half there.
As an American, I'm not super familiar with the traditional high tea ritual. Once for a bachelorette party I had tea at the Bellagio with a bunch of fancy ladies. We had champagne and lots of tiny delicious foods. This cake would have been a gaudy yet not unwelcome addition.