Step 1: For the lemon curd, place all the ingredients in a bowl and then place the bowl over a saucepan of gently simmering water, ensuring bowl does not sit in the water.
Step 2: Stirring the mixture, constantly, cook the curd until it thickens and when the lemon mixture has thickens, turn it into a clean bowl to cool.
Step 3: Cover the whole surface with plastic film and store in the fridge.
Step 4: To make the pastry, place the flour, lemon rind, butter and sugar in the bowl of a food processor and process together until crumbly.
Step 5: Add the egg yolk and water and pulse into a rough paste.
Step 6: Place 1/3 of the mixture in the freezer and the rest in the fridge and then after 20 minutes, roll out the larger piece and use this to line the base of a 20cm square slab tine.
Step 7: Prick the pastry all over with a fork and bake in a 180C oven for 10 minutes.
Step 8: Spread over 1/2 of the lemon curd and reserve the rest for another use.
Step 9: Then using the coarse cutter of a grater, grate the rest of the pastry over the top of the lemon curd and return to the oven and bake until golden brown.
Step 10: Cool and then lightly dust with icing sugar before cutting into fingers.
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