
Break eggs into a small bowl then strain through a sieve into a heatproof glass bowl to remove lumpy bits from the eggs.
Add yuzu juice, sugar, a pinch of salt and yuzu zest to the heatproof glass bowl and whisk together until well combined.
Set the heatproof glass bowl over a pot of simmering water.
Cook the mixture over low heat, stirring constantly, until it thickens and coats the back of a spoon. This should take about 10-15 minutes.
Remove the bowl from the heat and stir in the butter until melted and fully incorporated.
Transfer the curd to sterilized jars or containers and place a sheet of plastic wrap over the yuzu curd touching directly. This step prevents a skin from forming on top.
Let it cool to room temperature.
Put the yuzu curd in the fridge for at least 2 hours, as it will continue to thicken as it cools.