Coating something in a reduced sugary liquid that thickens on its surface into a shining, clinging layer.
Technique at a glance
A compact visual model of the lesson. Use the full mechanism and success criteria below when you practice.
Concept
Coating something in a reduced sugary liquid that thickens on its surface into a shining, clinging layer.
What changes
A glaze works because sugar concentrates as water leaves, and concentrated sugar syrup is viscous and sticky.
What good looks like
It coats the back of a spoon and a finger drawn through leaves a clean line that holds.
Practice counts when you cook
Reading this brief does not change your School state. Finish a real practice dish in Cook mode and log the cook; that cook is the evidence that advances the skill.
What to focus on
Mechanism
A glaze works because sugar concentrates as water leaves, and concentrated sugar syrup is viscous and sticky. Applied to a hot surface, the remaining water flashes off and what is left clings rather than runs. The timing constraint is the whole technique: sugars begin to caramelise around 160°C and carbonise not far above, so a glaze applied at the start of a long cook is black long before the food is done. It goes on at the end, and usually in thin successive coats, because each coat dries and the next has something to grip. In a pan glaze — vegetables finished in butter, stock and sugar — the same thing happens in miniature as the liquid reduces to a syrup that coats each piece. Fat in the glaze keeps it glossy and stops it setting hard as it cools.
Success criteria
It coats the back of a spoon and a finger drawn through leaves a clean line that holds.
The surface goes from wet-looking to genuinely shining, and stops running when the piece is tilted.
Bubbles get larger and slower as the syrup thickens.
In a pan, the liquid stops sloshing and starts moving as a mass with the vegetables.
Failure guards
Black, bitter patches.
Applied too early. Sugar carbonises well below roasting temperature, so a glaze needs the last few minutes, not the first hour.
The glaze ran off and pooled in the tray.
Too thin, or applied to a cold or wet surface. Reduce it further, and apply to something hot.
It set hard and cracked like toffee.
Reduced too far, or no fat in it. A little butter keeps a glaze pliable as it cools.