Egg yolks give this lemon curd a thicker, creamier texture with bright, tangy flavor. It’s perfect for scones and shortbread, and sturdy enough to use as a cake, tart, or pie filling.
Set a strainer over a bowl and keep it readily available near the stove.
In a heavy non-reactive saucepan, beat the egg yolks, sugar, and butter until well blended (beating the egg yolks into the butter and sugar will help prevent the eggs from curdling and clumping).
Stir in the lemon juice, zest, and salt. Cook over medium-low heat, stirring constantly, for about 10 to 12 minutes until thickened and has a glossy appearance. Try not to let the mixture come to a boil, if it begins to boil remove it from the heat for a bit, then return it to a lower heat. The curd should cling to a spoon or spatula and leave a trail if you run your finger through it.
Pour it into the strainer and press it with the back of a spoon. Discard the lemon zest and any lumps that are left behind in the strainer.
Place in the refrigerator to chill. The lemon curd will thicken more once it has chilled completely.
Notes
Yield & nutrition note: This recipe makes 1¼ cups of lemon curd. Nutrition is calculated using a 2-tablespoon serving size.Cook low and slow: Keep the heat gentle and stir constantly so the curd thickens smoothly without curdling or turning lumpy.Optional thickener: For a thicker curd, whisk 1 tablespoon cornstarch into the sugar before adding the other ingredients. This helps the curd hold up as a cake filling, especially for heavier cakes like butter cakes, but it still works well as a filling without it.