Sugar is a key ingredient in most cocktails. It’s also the one most bartenders take for granted. Understanding its different forms and functions is how you elevate the work — from the syrups you make for the back bar to the shrubs and oleos you reach for on the prep lab bench.
Kinds of sugar
Nature offers many different sugars. All sweet. Each with unique qualities.
- Glucose (also known as dextrose) is found in fruits, honey, and corn syrup. Less sweet and less soluble in water than sucrose. Begins to caramelize at around 300°F / 150°C.
- Fructose (also known as levulose) is the sweetest of the common sugars and the most soluble in water. Begins to caramelize at a much lower temperature — 220°F / 105°C.
- Sucrose is the scientific name for table sugar. Second-most soluble of the common sugars, it produces the greatest viscosity in a water solution. Begins to melt at around 320°F / 170°C and caramelizes at around 340°F.
Inversion: breaking sucrose into glucose and fructose
When a solution of sucrose is heated in the presence of acid, it breaks apart into its two component sugars — glucose and fructose. The process is called inversion, and the resulting mixture is referred to as invert sugar (or invert syrup). Inversion limits the extent to which sucrose can crystallize. Useful when you need a syrup to stay syrupy in the fridge.
What sweetness actually does
Sweetness is not a simple flavor profile. It helps mask or balance the sourness and bitterness from other ingredients, and it has a strong enhancing effect on our perception of food aromas. The quick action of fructose is said to enhance certain other flavors — particularly fruitiness, tartness, and spiciness — while the sweetness of sucrose takes some time to register on the tongue and lingers.
Caramelization
Caramelization is the name given to the chemical reactions that occur when any sugar is heated to the point where its molecules begin to break apart. As sugar is cooked, it loses sweetness and becomes darker and more bitter. The usual approach is to mix sugar with some water, then heat until the water has boiled off and the molten sugar starts to color.
The presence of water makes it possible to cook the sugar over high heat from the start without burning it. It also prolongs the cooking period, giving the reactions more time to proceed and developing a stronger flavor than heating the sugar on its own.
When sugars are cooked with ingredients that include proteins or amino acids — milk, cream — they participate with those proteins in Maillard browning reactions, producing a wider range of compounds and a richer aroma.
Sugar behind the bar
In bars, sugar is most often used in the form of syrup — commonly in a 1:1 or 2:1 (sugar to water) ratio. Whether you measure by volume or weight, a scale gives more accurate and consistent results. Combine sugar and water, stir over low heat to dissolve. If you have a Thermomix, set it to 60°C, speed 4, for 15 minutes. Alternatively, blend the sugar into the water without heat.
A less common but useful ratio is 1.5:1. The ratio can be adjusted to taste — keep in mind that the higher the sugar concentration (2:1, say), the less syrup is needed to achieve the same sweetness in the finished cocktail.
The sugar formulas worth memorizing
Sugar + Water = Syrup
Sugar + Juice = Cordial
Sugar + Fruits or peels = Oleo saccharum
Oleo + Juice = Sherbet
Sugar + Oleo/Juice + Vinegar = Shrub
Syrups can carry flavor, not just sweetness. Swap the water for tea, and you have a new array of syrups. Swap it for fruit juice — clarified if you want a clear final liquid — and the possibilities multiply. A good starting ratio for fruit-juice syrups is 2:1:1 (sugar : water : juice); from there you adjust according to the fruit and the result you want.
Another great use of sugar is its ability to draw moisture — and oils. This is called oleo saccharum: mix sugar in a bowl with fruits and/or peels, leave it overnight, and the sugar slowly draws out the essential oils, dissolving into a flavor-rich, thick syrup. Use it as is in small quantities, mix it with water to extend it into a syrup, or — if made with citrus peels — combine it with citrus juice to make a sherbet.
Sugar isn’t just a sweetener. It’s a tool — for balance, for texture, for aroma.