Punch recipes written for large American gatherings often begin with citrus peel and sugar rather than with juice. The preparation that results carries aroma that a conventional syrup cannot deliver.
What the preparation actually does
Citrus peel holds its aromatic oils in small sacs near the surface, separate from the juice and considerably more fragrant than it.
Packing peel in sugar draws those oils out by osmosis over several hours, producing a thick, intensely perfumed liquid without heat or added water.
The name simply describes the result, an oil and sugar preparation, and the method has been used in punch making for as long as punch has been recorded.
Why heat would ruin it
Citrus oils are volatile, which is exactly why they smell so strongly. Heating them drives the most delicate compounds off before they reach the bowl.
A syrup boiled with peel therefore tastes of cooked citrus rather than fresh, with a duller and slightly bitter character.
The cold extraction avoids that entirely, which is why the preparation is left to sit rather than accelerated on a stove.
How it changes the finished punch
Aroma dominates the impression of any drink, and a punch built on peel oil smells of citrus long before the first sip.
Juice alone contributes acidity and some flavor but very little aroma, so a punch made without the peel step tastes flatter than its ingredient list suggests.
Because the sugar is already flavored, it also replaces the plain sweetener, which keeps the recipe from growing another component.
Why it suits scale specifically
The preparation takes hours of waiting and almost no active work, which is the right shape of labor for a drink made for a room rather than a person.
It is also stable enough to make the day before, so the host is assembling rather than extracting when guests arrive.
Punch itself survives scaling for related reasons, which is why the format persists at American holiday gatherings where individual cocktails would be impractical.
What determines whether it works
Peel must be removed without the white pith beneath it, since pith contributes bitterness and holds no useful oil.
Thicker-skinned fruit yields more readily, and older fruit yields less, so the same recipe gives different results depending on what the store had.
Sugar type matters less than contact. Pressing the peel down and leaving it undisturbed extracts more than stirring, which mostly moves sugar around.