1.Preheat oven to 180°C (160°C fan-forced). Grease and line an 18 x 28cm slice pan.
2.Using an electric mixer, beat egg and caster sugar together until pale and thick. Add oil and beat until well combined. Fold in combined flours. Spoon into prepared pan and spread to cover base evenly. Bake for 20 minutes, until puffed and golden.
3.Meanwhile, prepare topping. Place brown sugar, butter and golden syrup in a heavy-based saucepan on low heat. Stir for 5 minutes, until butter melts and sugar dissolves. Simmer, without stirring, for 10 minutes, until caramelised. Add nuts.
4.Pour topping over base and, working quickly, spread evenly. Bake for another 10-12 minutes, until topping is golden. Cool in pan. Slice and serve.
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