Ingredients:
- 225g (8 oz, 1 cup) unsalted butter, cold and cubed
- 55g (2 oz, 1/4 cup) icing sugar, plus extra for dusting
- 300g (10.5 oz, 2 1/2 cups) all-purpose flour
- Pinch of salt
- 200g (7 oz, 1 cup) granulated sugar
- 4 large eggs
- 175ml (6 fl oz, ¾ cup) fresh lemon juice (from about 4-5 lemons)
- Zest of 2 lemons
- 115g (4 oz, ½ cup) unsalted butter, cubed
- 1 tbsp cornstarch
- Icing sugar
Instructions:
- Combine flour, icing sugar, and salt in a bowl.
- Rub in the cold butter until the mixture resembles breadcrumbs.
- Press the mixture firmly into the prepared baking pan lined with parchment paper.
- Prick the base all over with a fork.
- Chill in the fridge for 1 hour.
- Preheat oven to 350°F (175°C).
- Bake the chilled base for 15-20 minutes, or until lightly golden.
- Remove from oven and let cool slightly.
- In a saucepan, whisk together sugar, eggs, and cornstarch until smooth.
- Add lemon juice, lemon zest, and butter.
- Cook over medium-low heat, whisking constantly, until the mixture thickens enough to coat the back of a spoon (approx. 8-10 minutes).
- Remove from heat and strain through a fine-mesh sieve to remove any lumps.
- Pour the lemon curd filling evenly over the baked shortbread base.
- Bake for another 15-20 minutes, or until the filling is set but still has a slight wobble.
- Let cool completely in the pan. Chill in the fridge for at least 2 hours before cutting.
- Dust with icing sugar before slicing into squares and enjoy your a lemon slice.