I apologise for my culinary misdemeanors! I blame my mother, whose recipe this was!
In practice, we always add fruit, and my girlfriend likes Grand-Marnier!
The ingredients and proportions can of course be changed. The design issue was to arrange that each of the compartments had the correct volume. Increasing one manually decreases the neighbours and changes the total volume. Galapagos worked this out quite well, although the solution converged very slowly.
This is, of course, a somewhat tongue-in-cheek idea. The idea of a one-recipe measure is somewhat ridiculous, although this way, you don’t need to consult a book each time!