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Preheat the oven to 180°C/350°F/Gas mark 4.
Grease a 23cm/9in round cake tin with butter or
oil, then line the base with baking parchment.
-
Dust with a little extra caster sugar and flour.
Place the eggs, 100g/4oz sugar and all the lemon
zest in a large deep bowl.
Whisk vigorously until very thick and light.
-
Fold the sifted flour lightly into the
mixture with 50g/2oz hazelnuts. Spoon the
mixture into the prepared tin and level the
surface.
-
Bake in the oven for about 35 minutes
or until firm to the touch. Turn out and cool on
a wire rack.
-
Make a syrup from the water,
remaining sugar and 2 tablespoons lemon juice.
Reserve
2 peaches to decorate.
-
Skin and slice the
remaining peaches and poach
for
5 to 10 minutes in the sugar syrup, until
tender, then drain. Split the gateau into 3
layers.
-
Spread the bottom layer with half the
whipped cream and half the peaches, top with the
middle third of the gateau and repeat
the
cream, peaches and top cake layer.
-
Refrigerate
for at least 2 hours.
At serving time, slice the reserved peaches and
use to decorate the top of the gateau with the
rest of the hazelnuts.