In a pot combine the eggs, sugar and yuzu juice. Grate the zest of the lemon and squeeze the juice of the lemon over the mixture.
Whisk well to combine.
Now place the pot on the stove on low heat while constantly stirring the mixture.
Slowly bring to a simmer and immediately remove the pot from the heat. You want the curd to thicken but not boil otherwise the eggs will start to scramble.
Add the butter cubes one by one and incorporate into the curd with a whisk.
Place the pot back on the stove and bring the curd slowly back to simmering point while whisking. Set aside
Lastly, strain through a sieve while still warm and pour into glass jars or ramekins.
Leave in the fridge to cool. Cover with a lid once cooled.