01 -
In a medium saucepan over medium heat, combine blueberries and lemon juice. Stir and cook until the berries burst and release their juice, approximately 5–7 minutes.
02 -
Pass the cooked blueberry mixture through a fine-mesh sieve into a bowl, pressing firmly to extract as much liquid as possible. Stir in lemon zest and set aside.
03 -
In a heatproof bowl, whisk whole eggs, egg yolks, and granulated sugar together until the mixture is smooth and well combined.
04 -
Gradually whisk the blueberry-lemon juice blend into the egg mixture until fully incorporated.
05 -
Set the bowl over a pot of simmering water, ensuring the base does not touch the water. Add a pinch of fine sea salt. Stir constantly with a wooden spoon or heat-resistant spatula until the curd thickens and coats the back of the utensil, about 10–15 minutes.
06 -
Remove the bowl from heat. Add the butter cubes one at a time, stirring thoroughly after each addition until smooth.
07 -
Strain the curd through a clean fine-mesh sieve into a storage container or jar for a silky finish. Let cool to room temperature, then transfer to an airtight container. Place plastic wrap directly on the surface to prevent a skin from forming and refrigerate.