Beat together the eggs, egg yolks, sugar, zest and juice. Pour into a small saucepan and stir over low-medium heat until the sugar has dissolved.
Add the cold butter a couple of pieces at a time, stirring until each addition is melted and incorporated. Make sure not to let the curd come to a bubble at any time.
Continue cooking the mixture another few minutes until it is thickened and coats the back of a spoon or leaves a thick coating on the side of the pan when you tilt it.
Pour the mixture through a fine-mesh strainer into a clean bowl to remove any bits of egg that may not have mixed through.
Pour into sterilised conserve jars and cool at room temperature for 30 minutes. Seal the jars and store in the fridge. See notes for how long to keep.
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