Making Lemon Curd from Scratch
Lemon curd is a process of controlled coagulation. You cook citrus juice, sugar, eggs, and butter over gentle heat until the proteins thicken the liquid into a stable, glossy cream that coats the back of a spoon. It relies entirely on timing and heat management to avoid scrambling the eggs.
Temperature control is your only concern.
If the heat is too high, you will end up with sweet scrambled eggs. Keep the flame low and keep your whisk moving at all times.
- non-reactive stainless steel saucepan
- fine-mesh sieve
- balloon whisk
- heat-proof spatula
What goes in.
- 3 largelemons (zest and juice)
- 1 cupgranulated sugar
- 3 largewhole eggs
- 1 largeegg yolk
- 4 tbspunsalted butter, cold and cubed
Tempering and whisking
Whisk the eggs and sugar thoroughly before adding the juice to ensure the acid doesn't immediately seize the yolks. Constant agitation while cooking forces the butter to emulsify into the curd, creating a smooth, velvety finish.
The method.
Prepare the base
In the saucepan, whisk the sugar, eggs, egg yolk, lemon zest, and lemon juice until the mixture is uniform.
Cook gently
Set the pan over low heat. Stir constantly with your spatula, making sure to scrape the corners of the pan so nothing sets prematurely.
Add the fat
Once the mixture begins to steam, add the cold butter one cube at a time, whisking to incorporate before adding the next piece.
Test for doneness
The curd is ready when it is thick enough to hold a clear track drawn through it on the back of your spatula. Remove from heat immediately.
Strain and chill
Push the warm curd through a fine-mesh sieve into a bowl to remove the zest and any stray bits of cooked egg. Press plastic wrap directly onto the surface to prevent a skin from forming.
Other turns to take.
Lime or Grapefruit Curd
Replace the lemon juice and zest with an equal amount of fresh lime or grapefruit; adjust sugar slightly if using particularly bitter grapefruit.
When it doesn't go to plan.
Use a stainless steel pan; aluminum or cast iron will react with the acid and turn the curd a metallic, unappetizing gray.
If you see small lumps, do not panic. The sieve will catch them as long as you act quickly.
Let the curd cool completely in the refrigerator; it will continue to thicken as the butter sets.
The ones that keep coming up.
Can I use bottled juice?
Bottled juice lacks the brightness and aromatic oils found in fresh zest and juice. It will result in a flat, one-dimensional flavor.
Why did my curd separate?
The heat was likely too high or you stopped whisking. Keep the movement consistent to maintain the emulsion.
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