4 organic free range yolks
100g castor sugar
Zest of 2 lemons
125ml lemon juice
180g cold diced unsalted butter
Whisk together egg yolks, sugar, lemon juice and zest in a saucepan.
Place on medium heat stirring constantly until the mixture is thick enough to coat the back of a wooden spoon.
Slowly add the butter and stir until smooth.
Transfer to heatproof bowl and lay a sheet of plastic wrap directly on the surface to aviod a skin forming.
Cool for at least one hour.
Store in an airtight container in the fridge.
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