When it goes wrong · Temper
Scrambled specks in a custard or sauce.
Can you save it?
Reviewed for this symptom
Off the heat immediately, strain through a fine sieve and blend or whisk hard to break the curds up; if only lightly scrambled it will pass for smooth. Once it has set into solid curds nothing recovers it — use it as a base for something baked.
How to confirm the diagnosis
Observable cues, not inferred user state
- Small specks in an otherwise smooth custard
- The hot liquid went in fast
- The custard reached a simmer
Not this?
- A cheese sauce turns stringy with an oily slick.
- Sour cream or yogurt curdles into grains in a hot pan.
- Melted chocolate seizes into a stiff paste.
- The cheesecake filling curdled and turned grainy.
What actually happened
Only this symptom
Hot liquid added too fast, or the mixture went above about 73°C. The egg proteins coagulated locally before the whisk could distribute the heat.
The full mechanism
Shared by every temper failure
Egg proteins begin to set around 65°C and are firmly coagulated by about 73°C. Dairy proteins clump when heated fast or in the presence of acid. Chocolate and cheese release their fat when their structure tightens. In each case the failure is not the final temperature but the rate of change at the point of contact: pour hot liquid into cold yolks and the yolks at the interface pass through the whole setting range instantly, while the rest of the bowl is still cold. Tempering removes the interface — you add the hot thing to the cold thing a little at a time, so the cold mixture's temperature rises gradually and no part of it is ever far ahead of the rest. The same reasoning covers stirring cheese into a sauce off the heat and letting cream come to room temperature before it meets a hot pan.
The full Temper lesson — how to tell, where to practise it, what it carries to.
Next time
Prevent this specific failure
Add the hot liquid to the yolks a ladle at a time, whisking, and keep the finished custard below about 80°C.
What right looks like
Shared by every temper failure
- The tempered mixture thins slightly and warms to the touch of a finger on the outside of the bowl, with no lumps forming.
- It stays glossy. Any dulling or graininess means proteins have started to set.
- When enough hot liquid has gone in, the two mixtures pour at the same speed — that is the point at which the rest can be combined all at once.
- For cheese, the shreds disappear into the sauce rather than stringing behind the spoon.