A slice of orange is the most classic touch in drink service. But the dried product makes an entirely different contribution from a fresh slice.
What do the peel oils do?
Glands of volatile oil sit in orange peel.
Those glands contain a terpene called limonene.
Limonene is the main source of the characteristic smell of orange.
That oil gets released when the peel gets squeezed or heated.
The acid and sugar in the flesh make a different contribution.
What matters in drink service is the oil in the peel.
Drying removes the water from the flesh while largely preserving the oil in the peel; that explains why a dried slice gives a strong aroma.
| Drink | Slices | Wait | Effect |
|---|---|---|---|
| Hot tea (300 ml) | 1 | 3-4 minutes | Clear aroma |
| Salep (250 ml) | 1 | 2 minutes | Light aroma |
| Mulled wine (200 ml) | 1-2 | 10 minutes | Intense aroma |
| Cocktail (200 ml) | 1 | Immediate | Visual and aroma |
| Soda (250 ml) | 1-2 | 5 minutes | Moderate aroma |
| A jug (1 litre) | 3-4 | 15 minutes | Balanced |
What does drying change?
A fresh orange slice is 86 percent water by weight.
Drying brings that to 8 or 12 percent.
The flesh shrinks and darkens.
The peel largely keeps its shape.
The oil glands do not dry out; the oil is volatile but survives within the structure of the peel.
The result is a slice with weakened flesh and a strong peel.
That means the contribution in aroma comes directly from the peel, and the effect is most pronounced in hot drinks.
How are they used in hot drinks?
Heat accelerates the release of the peel oils.
One slice goes into three hundred millilitres of hot tea.
The aroma opens within three or four minutes.
It goes well with black tea, green tea and herbal infusions.
It gets used in salep and hot chocolate too.
It is a classic component in mulled wine, used alongside cinnamon and cloves.
Long standing brings bitterness; the white part of the peel — the albedo — contains bitter compounds and that bitterness passes into the liquid after ten minutes.
How are they used in cocktails?
Two forms of use exist in a cocktail.
The first goes into the glass; the slice sits among the ice.
The aroma passes slowly.
The second goes onto the rim; the slice gets cut at one point and slides onto the edge.
That is an entirely visual use.
But the drinker takes in the smell of the peel as the glass approaches.
Smell is an important part of the perception of taste; a garnish on the rim is therefore not only decorative but a choice affecting the experience.
Which cocktails does it suit?
Orange is a classic component in particular families of cocktail.
It is widespread in whisky-based drinks such as an old fashioned.
It goes well with bitter liqueurs such as Campari and amaro; bitterness and citrus balance each other.
It gets used in gin-based drinks too.
Among alcohol-free options it works with soda, tonic and iced tea.
Lemon and lime suit clear vodka-based cocktails better; orange carries a heavier aroma and disturbs the lightness of those drinks.
How does a rim garnish work?
The slice gets cut from one edge toward the centre.
The cut slides onto the rim of the glass.
A dried slice is sturdier than a fresh one; it does not fall off the rim.
A fresh slice slides down under its own weight.
The cut gets made with a sharp knife.
A dried slice is brittle; a forced cut splits it in two.
Alternatively it goes over the glass on a cocktail stick; that gives a cleaner presentation particularly in wide-mouthed glasses.
How many orange slices go in?
Dried orange carries an intense aroma.
One slice suffices for a glass.
Two make the aroma dominant.
Three or four slices per litre in a jug.
Two slices in mulled wine; because the standing time is long the quantity can run a little higher.
The thickness of the slice matters too; three or four millimetres is standard, while a thicker slice carries more peel oil and acts more strongly.
What other citrus works?
The same technique works with other citrus.
Lemon is the sharpest; its acid is high and its aroma pronounced.
Lime points in a more tropical direction.
Grapefruit is bitter; its peel is thicker and the risk of bitterness higher.
Mandarin is the sweetest and softest; its peel is thin and easy to dry.
Blood orange is the most striking visually; its deep red colour largely survives drying and creates a clear contrast in the glass.
How are dried orange slices stored?
Dried citrus takes up moisture.
It sits in an airtight container.
Slices that take up moisture turn flexible and stick together.
Somewhere cool and dark they last anywhere from six months to a year.
Light fades the colour in the peel.
The aroma weakens over time too; the volatile oils evaporate slowly.
After a year a slice still serves visually, though its contribution in aroma has fallen markedly, and that is acceptable or not depending on the purpose.
How do they get dried?
Orange slices get dried by two methods.
The first is an oven; the slices get cut three or four millimetres thick and go onto a wire rack.
Three to five hours at seventy degrees.
The oven door stays slightly ajar so the moisture escapes.
The second is a dehydrator; eight to ten hours at sixty degrees.
It gives a more even result and preserves the colour better.
Drying at a high temperature darkens the slices and drives off most of the volatile oils in the peel; a low temperature over a long period always gives a better result in aroma.
