tbridge:
dennymayo replied to your post: What would the A-B test look like? I have more limes…
As I read it, the oil won’t go into water/booze without sugar - hence the need for the simple syrup. Simple syrup is less polar than booze, making a better solvent for the oils.
This man should know - he is a Professional Chemist.
So, does that mean we should muddle the citrus with sugar before doing the soaking?
I’m neither Italian nor a professional chemist, but I have read enough on booze to know that mumble-mumble oil sugar mumble (“less polar … yeah. That.”). My empirical results with punch with and without oleo-saccharum do show that there’s something to the practice. In general some things are soluble in water, some are soluble in alcohol, and some aren’t really soluble in either, but the sugar helps (while sugar itself is more soluble in water than in alcohol, which is why you make syrup in the first place).
That said, I just googled and essentially every recipe I found for a ‘cello said to combine the peel (or the zest) with the booze and let it sit for some amount of time (minimum of a couple weeks, in general), and so if nothing else the way you’re doing it is the way countless Italians have done it, and thus certainly Not Wrong.
The A-B test I’d design would probably be something like an A-B-C test, in the end: A) do what you’re doing; B) using the same amount of sugar you’d use, first make an oleo-saccharum, then add the same amount of hot water, stir to dissolve the sugar, let cool, add booze, steep the whole mess for however long; C) make the oleo-saccharum, add the hot water, stir to dissolve sugars, cool, strain, add booze. Or, if you’re feeling truly ambitious, strain out the peels, add a shot of booze to the syrup (to prevent spoilage), then combine the somewhat-spent peels and the booze and steep that mess for however long (storing the syrup in the fridge for as long as that takes).
So, four tests. Are you America’s Test Kitchen?