Heatproof Bowl (I use a glass Pyrex bowl) or double boiler
Whisk
Ingredients
3Lemonszest and juice (about 120g juice)
150gSugar
1wholeEgg
2Egg yolks
85gButter
pinchSaltif using unsalted butter (optional)
Instructions
Fill a small saucepan with 1 to 2 inches of water and bring to a boil. Lower the heat slightly to a strong simmer.
While the water is heating, place the lemon juice and zest, sugar, egg, and egg yolks into a heatproof bowl that fits over the saucepan without touching the water. Whisk the mixture until thoroughly combined, then keep mixing as the lemon curd begins to thicken. You want to whisk fairly constantly so the eggs don’t get a chance to scramble. Keep going until the lemon curd thickens enough to coat the back of a spoon, about 10 minutes.
Turn off the heat and slowly add the cubes of butter, whisking as you go. Continue to whisk thoroughly until all the butter is incorporated and the lemon curd is nice and smooth. It should be fairly thick, but will thicken up even more as it cools.
You can store the lemon curd in any airtight container, but it will last longer in a sterilized jar. To sterilize your jars, pour boiling water inside and allow to sit for a few minutes before carefully emptying them out. Once the curd is done, use a stainless steel jar funnel and ladle to carefully fill the jars, leaving around 1cm head room at the top of the jar. Place the lids on and seal immediately. Leave the jars on the counter to cool, then transfer to the fridge.