Rub the superfine sugar and lemon zest together in a small bowl using your fingertips until the sugar becomes fragrant and slightly damp. This helps release the natural oils from the zest and boosts the lemon flavor.
½ cup superfine sugar, 2 tablespoon lemon zest
Transfer the lemon sugar to a small saucepan. Add the egg yolks and whisk until smooth, then add the lemon juice, butter, and salt and whisk again to combine. Place the pan over medium to medium-low heat.
½ cup fresh lemon juice, 6 large egg yolks, 7 tablespoons unsalted butter, 1 pinch sea salt
As the butter melts, whisk occasionally. Once fully melted, whisk continuously in a slow, steady motion. After about 3 to 4 minutes, the mixture will start to bubble gently and thicken. Continue whisking for another minute until it reaches a custard-like consistency that coats the back of a spoon.
Remove the saucepan from the heat. If you notice any small bits of cooked egg, strain the curd through a fine sieve into a clean bowl.
Cover the surface of the lemon curd directly with plastic wrap to prevent a skin from forming. Let it cool at room temperature for about 30 minutes, then refrigerate for at least 1 hour until fully chilled and set.
Notes
Tips & Tricks
Low and slow is key: Cooking the curd gently prevents the eggs from scrambling and keeps the texture smooth and creamy.
Straining makes it silky: If you want ultra-smooth lemon curd, always strain it after cooking.
Zest first, then juice: Always zest your lemons before juicing for the best flavor and ease.
Storage: Store lemon curd in an airtight container in the fridge for up to 1 week.
Freezing: Lemon curd freezes well for up to 3 months. Thaw overnight in the refrigerator.
Uses: Spread on toast, swirl into yogurt, spoon over pancakes, or use as a cake and tart filling.