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1
Make the caramel by boiling the sugar and water in a saucepan, stirring continously over low-medium heat until the sugar is melted and becomes golden brown.
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2
Pour the syrup in a 9in round baking pan, tilting to make sure the whole surface is covered.
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3
Set aside to allow the caramel to harden.
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4
Preheat the oven to 180AsC (350AsF).
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5
Gently combine all the custard ingredients in a separate bowl and whisk gently preventing any bubbles from forming.
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6
Strain gently into the caramel-lined baking pan.
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7
Make the cake by beating the egg yolks with the sugar gradually, stirring until light and creamy.
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8
Add the flour alternately with the diluted milk, beginning and ending with flour.
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9
Add lemon rind and beat until smooth.
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10
Set aside.
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11
Whisk the egg whites and add the cream of tartar, beating to soft peaks.
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12
Add the sugar gradually and continue beating until stiff.
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13
Fold a third of the meringue into the cake mixture to loosen it.
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14
Gently fold in the remaining egg white mixture.
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15
Pour gently the mixture into the prepared custard pan.
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16
Do not beat/stir.
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17
Place the cake pan in a bain-marie (bagno maria).
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18
Bake in the oven for an (1) hour or until the mixture is firm.
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19
Remove from the oven and place on a wire rack to cool until room temperature.
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20
Remove from water to cool completely.
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21
To serve, run a spatula or knife along the edge of the mold/pan to loosen the caramel.
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22
Transfer into a serving round dish and chill before serving.