Sugar Confectionery Production: Boiled Sweets, Fondant, Caramel, Toffee, Gums and Jellies
The exam tests the process logic behind each sugar confection: how the sugar/glucose/water ratio, cook temperature, acid dose and cooling regime determine texture, and how to correct a batch that has gone wrong.
Core rules
- Boiled sweets: sucrose with glucose syrup and/or invert to prevent graining. Typical doctoring ratio around 50:50 to 60:40 sucrose:glucose syrup solids; invert often limited to roughly 10–15 % of total solids. Cook to about 145–155 °C, often under vacuum, to reach ~1–2 % moisture.
- Fondant: cook to ~114–118 °C, cool rapidly to ~40 °C, then beat to generate fine sucrose crystals in a saturated syrup; the crystal size controls smoothness.
- Caramel and toffee: sugar, glucose, milk, fat and sometimes salt; cook to ~118–125 °C. Flavour comes from Maillard browning (milk protein + reducing sugar) and caramelisation; toffee is distinguished by higher fat and a chewier, less grained texture.
- Gums and jellies: set by gelatin, pectin, starch or gum arabic. Pectin jellies need controlled pH and a sugar solids level near 78 %; starch gums are cast in moguls and dried for many hours.
- Acid addition lowers pH, inverts sucrose, and increases hygroscopicity - dose late and dose by specification.
Worked example
A pectin jelly batch sets slowly and slumps in the starch mould. Measured pH is 3.8 against a target of 3.2. Reasoning: high-methoxyl pectin needs hydrogen ions to reduce electrostatic repulsion before the calcium-independent junction zones form; at pH 3.8 the set is too slow for the depositing window. Correct by adding a buffered citric acid solution to bring pH to 3.2, re-check solids at 78 %, and confirm set before the batch leaves the depositor.
Traps
- Judging the cook by temperature alone and never checking final moisture.
- Forgetting that glucose syrup solids, not syrup weight, set the doctoring ratio.
- Adding all acid early and over-inverting the batch.
- Blaming the recipe for graining when the cause is sucrose dust or dirty seed crystals on the line.