• Preheat the oven to 350°F (180°C) and line a 9x9 inch pan with parchment paper. Leave a bit of an overhang so the orange bars can be lifted out later.
• In a food processor, blend together the softened butter, flour, orange zest, sugar, and salt until it creates a soft dough.Press the crust mixture into the bottom of the prepared pan.
• Bake this in the oven for 20 minutes until very light golden brown.

Orange curd

• Whisk the flour and the sugar in a large bowl to eliminate flour lumps. Then add the eggs, orange juice, zest, and lemon juice and mix until well combined, but not so much that it becomes frothy.
• Pour this carefully on top of the hot crust.
• Bake for around 20 minutes until the curd layer has set. Slightly shaking the pan will show if it has set or not. There should not be a wobble to the curd. The bake time will change depending on your oven.
• Once baked, cool to room temperature on a wire rack, then refrigerate for at least an hour before slicing.
• Use a sharp knife to cut the bars into 16 pieces. Dust confectioners' sugar over the top when serving, and garnish with a sprinkle of orange zest.