This Tart au Citron is a classic French dessert featuring a buttery pastry filled with a tangy lemon custard.
Pastry
250g flour
150g butter
30ml icing sugar
Zest of 1 lemon
1 egg
Filling
350g (about 8) eggs
250g castor sugar
200g crème fraîche
200ml lemon juice
1 egg white
TO MAKE THE PASTRY
Place the flour, butter, icing sugar and zest in a food processor and pulse to mix well (coarse crumbs).
Add the egg mixture slowly while pulsing slowly – until the pastry forms a ball. Form pastry into a disc of about 15 cm in diameter, cover and place in fridge for 30 minutes before use.
Preheat the oven to 170° Roll out the pastry between two sheets of baking paper or on a floured worktop to about 4mm thick.
Lightly prick pastry with a fork (not too much).
Place pastry in a 24 cm-diameter, greased, loose bottomed pie dish, leaving pastry hanging over the edges. Press pastry into the edges of the tin (use a ball of excess pastry). Place in fridge for 30 minutes.
Line pastry case with foil, fill with baking beads, and blind-bake until pastry is cooked through (about 30 minutes). Remove baking beads and foil, reduce oven to 150°C and bake until golden brown and crisp.
Patch any holes with left over pastry and brush with the whisked egg white inside the tart (will prevent filling seeping into pastry). Return to the oven for about 2 minutes. Cool.
START WITH YOUR FILLING
Whisk eggs lightly to break up. Add castor sugar and stir with a whisk (do not beat – you do not want to incorporate air bubbles) until sugar starts to dissolve and mixture is glossy and syrup-like. Set aside, stirring occasionally, until sugar is completely dissolved (about 30 minutes). Whisk crème fraîche in another bowl with a little of the egg mixture to just loosen. Add lemon juice to egg mixture, then add crème fraîche a little at a time. Keep aside.
Leave oven at 150°C
Skim foam off the filling, pour into a jug and fill the tart case.
Bake until the tart is set (about 30 minutes)
Cool tart for 5 minutes, then trim the overhanging crust with a sharp knife.
Cool tart for at least one hour before removing from the tin. Dust with some more CASTOR SUGAR and use a blowtorch to scorch the sugar to make a thin, crispy crust.
Serve with whipped cream on the side.
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