Lemon Curd

Notes
- Absolutely DO NOT EVER use an aluminum saucepan for this recipe. It’ll react with the lemon juice and turn the curd grey.
Ingredients
- 1 1/4 cup (250 g) sugar
- 6 tbsp (60 g) cornstarch
- 1/2 teaspoon fine salt
- Zest of three lemons
- 1 1/4 cup (300 mL) fresh lemon juice
- 1 1/4 cup (300 mL) water
- 5 large egg yolks
- 4 tbsp (60 g) unsalted butter, cut into small pieces
Steps
- Whisk together the sugar, cornstarch, salt, and lemon zest in a medium saucepan.
- Gradually (so as to prevent clumping) add the lemon juice and water and whisk to combine. Whisk the egg yolks in a separate medium bowl.
- Place the sugar mixture over medium heat and cook, continuing to gently whisk, until the mixture begins to bubble and is extremely thick (about one minute from the first bubble).
- Temper the eggs yolks by slowly, a couple spoonfuls at a time, adding half of the hot sugar mixture to the yolks while constantly whisking. Add the tempered yolks to the saucepan and return to the heat. Bring the mixture back to a simmer and cook, stirring constantly with a rubber spatula, for 1 minute. Remove from the heat and stir in the butter until completely melted and incorporated.
- Pour curd through a fine-mesh sieve into a glass bowl. Press plastic wrap against the surface of curd (to prevent a skin from forming) and refrigerate until cool.
Source
https://www.foodnetwork.com/recipes/food-network-kitchen/classic-lemon-meringue-pie-5608977