Line Baking Pan: Line a 9 x 9 inch (22cm x 22cm) square baking pan with parchment paper. Set aside.
Crush Biscuits: In a high-speed food processor, crush biscuits to a crumb. Transfer to a large mixing bowl.
Add Coconut: Stir through desiccated coconut and lemon zest.
Mix Wet Ingredients: Add the melted butter and lemon juice. Mix until well combined and it sticks together.
Press into Pan: Firmly press the mixture into the lined pan. Use the back of a spatula, a wooden spoon, or your hands to ensure the base is compact.
Chill: Place the pan in the refrigerator to chill while preparing the topping.
Lemon Icing
Melt Butter: In a small-medium sized saucepan, add butter and place over a low-medium heat. Warm through until butter has completely melted, stirring occasionally.
Add Lemon Juice: Turn off the heat and stir through the lemon juice.
Mix in Icing Sugar: Add the sifted powdered sugar and whisk until well combined and no lumps remain. It will become thick and smooth.
Spread Icing: Pour icing over the chilled base and smooth out evenly.
Chill to Set: Return to the refrigerator to chill for a further 3-4 hours or until the icing has set and is firm to the touch. You can also leave it overnight for easier slicing. Enjoy!
Notes
Store: Place the lemon slices in an airtight container and store in the refrigerator for up to 5 days.
Freeze: For longer storage, freeze the slices in a single layer on a baking sheet before transferring to a freezer-safe bag or container. They can be frozen for up to 3 months.
Thaw: Thaw the slices in the refrigerator overnight. For best texture, let them come to room temperature before serving.