Preheat oven to 160℃. Line 2 baking trays with baking paper.
Mix softened Butter, Sugar and Custard Powder until smooth and well combined. Add Plain Flour and Lemon Zest and mix well. Use your hands to bring the dough together in the bowl.
Divide the dough in half, so that it would be easier to manage. Roll out the dough on a floured surface until 8mm thick and cut out discs. (*I used 4.5cm round cutter.) Repeat with the remaining dough.
Bake for 15 to 20 minutes, swapping trays halfway through cooking. Set aside on the trays for 10 minutes to cool before transferring to a wire rack to cool completely.
To make Lemon Cream, place all ingredients in a bowl and mix well until smooth.
Place heaped teaspoonful of Lemon Cream on a cookie and sandwich together.
*Leftover Lemon Cream: If you ever have leftover Lemon Cream, why don’t you make a mug cake? Add Egg (OR Milk) and mix well, then add Self-Raising Flour to make cake batter. Half fill a mug and cook in the microwave. My microwave cooks in 90 seconds at high power.
