Sugar cookery documented in European and Middle Eastern cuisine from medieval times; formal sugar stage nomenclature developed in French patisserie tradition from the 17th century
Caramelisation is the pyrolytic degradation and polymerisation of sugars at elevated temperatures — a non-enzymatic browning reaction distinct from the Maillard reaction (which requires amino acids). Pure sucrose begins caramelising at approximately 160°C, passing through a series of colour and flavour stages as it decomposes into hundreds of volatile and non-volatile compounds including diacetyl (buttery), furans (caramel-sweet), and hydroxymethylfurfural (bitter, roasted). The dry method involves heating sugar directly in a pan without water. The sugar melts unevenly, requiring careful monitoring and gentle agitation or swirling to distribute heat evenly. The dry method progresses faster and is more difficult to control for beginners, but produces a deeper, more intense caramel at equivalent temperatures because there is no dilution from water and no slow evaporation phase. The wet method dissolves sugar in water (typically 30–40% water by weight of sugar) before cooking. The water must first evaporate before the sugar can concentrate and then caramelise — this extended evaporation phase provides additional time for temperature control. The solution passes through the thread, soft ball, firm ball, hard ball, soft crack, and hard crack stages (100°C through 155°C) before caramelisation begins. At hard crack (149–154°C), the sugar is anhydrous; at this point it enters caramelisation territory rapidly. Crystallisation is the principal risk of the wet method: any nucleation point (undissolved sugar, impurities, a grain of sugar on the pan side) can trigger rapid recrystallisation — 'seizing'. Prevention strategies include adding glucose syrup or corn syrup (which is non-crystallising), wiping pan sides with a wet pastry brush, adding a small amount of acid (cream of tartar, lemon juice), and avoiding stirring once the solution is on the heat. For sauces and salted caramel, cream and butter are added at the caramelisation stage — this interrupts the reaction and stabilises the caramel as an emulsified sauce.
Caramel depth corresponds directly to cooking temperature and colour — from delicate sweet-butter at pale gold to bitter, roasted complexity at deep mahogany
Sucrose caramelisation begins at ~160°C — below this temperature, colour changes are from impurities or Maillard if protein is present Dry caramel progresses faster and requires vigilant attention; wet caramel provides more control through the slow evaporation phase Crystallisation prevention in wet caramel: use glucose syrup, acid addition, and wet brush to wash pan sides Colour is the primary indicator of caramel stage — pale gold (mild, sweet), amber (balanced), deep mahogany (intense, bitter) For caramel sauce, add warm cream to prevent violent spattering; cold cream causes shock crystallisation and lumping Butter emulsifies into finished caramel at the end — stir in cold, cubed butter vigorously off the heat for a stable sauce
Use a heavy-bottomed stainless steel pan — avoid non-stick, which degrades at caramelisation temperatures, and avoid copper without tin lining A digital instant-read thermometer removes all guesswork — but also train your eye to read colour as a backup For dry caramel without stirring, swirl the pan gently to redistribute liquid sugar while solids melt at edges For salted caramel, add fleur de sel after emulsifying butter — salt added too early can inhibit caramelisation and affect colour For spun sugar or pulled sugar work, add 10% glucose to the wet caramel to prevent crystallisation and extend workability
Stirring a wet caramel once it has begun boiling, which introduces crystallisation nuclei and causes the batch to seize Using a pan that is too light and thin, causing hot spots that burn sugar before the rest of the pan caramelises Adding cold cream to hot caramel — the violent boil-up is controllable, but thermal shock can cause lumping; use warm cream Taking the caramel off too early (pale gold) for applications requiring depth — under-caramelised sugar is simply sweet without complexity Not having all additions ready before caramelisation is complete — overcooked caramel is irreversible