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Step 1
Grease and line base of a 4cm-deep, 30cm x 20cm slice pan.
Step 2
Place the butter and icing sugar in a food processor and process until well combined. Add 2 cups (300g) of the flour and process until the mixture comes together in a ball. Press into the base of the prepared pan and chill for 15 minutes.
Step 3
Preheat the oven to 170°C.
Step 4
Place pan in the oven and bake for 15 minutes, then set aside to cool while you prepare the topping. Finely grate rind from 2 of the lemons, then juice all 4 (you will need about 90ml of juice).
Step 5
Whisk together eggs and caster sugar in a large bowl until well combined. Add remaining flour, and the baking powder, rind and juice. Whisk gently to combine. Pour mixture over cooled base and return to oven for a further 30 minutes or until topping is set and tinged golden. Cool in the pan, then cut into slices.
Step 6
Dust with extra icing sugar to serve.