Tart and tangy homemade lemon curd that is thick enough to use as a cake filling, tarts or filling pastries. Making your own lemon curd is so easy and a great way to use up extra egg yolks.
Zest the lemons, then slice them in half and juice them into a measuring cup. Use a small colander or a lemon juicer to keep out any seeds.
Add your lemon juice, granulated sugar, and lemon zest and citric acid to a large, shallow metal bowl over a simmering pot of water.
Stir constantly until the mixture reaches 170ºF and begins to thicken.
Remove the mixture from the heat and add the butter in chunks on top and allow it to melt.
Once the butter is melted, you can mix it all together. Strain the mixture if you have small chunks of egg that need to be removed.
Pour the finished lemon curd into a heat-proof jar or bowl. Cover the curd with plastic wrap so that it is touching the surface of the curd without any air bubbles in between, this will prevent a skin from forming on the top of the curd. Store it in the fridge for up to one week or freeze it for up to a year.
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Notes
Whisk constantly while cooking to prevent the eggs from scrambling and to ensure a smooth, creamy texture.
Do not let the lemon curd boil, because high heat can cause the eggs to curdle and create a grainy texture.
Use fresh lemon juice and zest for the best flavor, since bottled juice will taste dull and less vibrant.
Straining the curd is optional, but it will give you a perfectly silky texture and remove any bits of cooked egg or zest.
Add the butter after removing the curd from the heat so it emulsifies properly and creates a smooth finish.
If your curd seems too thin, continue cooking it gently until it reaches 170–175°F, which is when it fully thickens.
The lemon curd will thicken more as it cools, so do not overcook it trying to make it thick right away.
Store the lemon curd in the refrigerator for up to one week in an airtight container.
Place plastic wrap directly on the surface of the curd while cooling to prevent a skin from forming.