Instructions

1. Preheat the oven to 180c and line an 8×8 inch baking dish with parchment paper.
2. Make the shortbread base by adding the softened butter, flour and caster sugar to a large bowl.
3. Mix firstly with a spoon until the ingredients are well combined then use your hands to rub the ingredients together further.
4. Add this to the lined baking dish, pressing it evenly across the base of the dish.
5. Smooth down with the back of a spoon and then bake for 20 minutes.
6. In the meantime make the lemon filling by adding the caster sugar, flour, lemon juice and eggs to a bowl. Whisk together with a hand whisk.
7. When the shortbread base has finished cooking, remove the dish from the oven and pour the lemon filling on top.
8. Bake for another 20 minutes.
9. Remove the dish from the oven and allow it to cool a little. Then transfer to the fridge and leave it to fully chill for 1 hour.
10. Decorate the top with icing sugar and cut into 9 bars.