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1
Preheat the oven to fan 160C/conventional 180C/gas 4. Butter and line an 18cm round, 7cm deep cake tin with greaseproof or parchment paper.
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2
Put the flour, bicarbonate of soda and all the spices into a large mixing bowl. Add the butter and rub it into the flour with your fingertips until the mixture resembles fine breadcrumbs.
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3
Put the sugar, treacle, syrup and milk in a medium saucepan and heat, gently stirring until the sugar has dissolved. Turn up the heat and bring the mixture to just below boiling point.
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4
Add the stem ginger to the flour mixture, then pour in the treacle mixture, stirring as you go with a wooden spoon. Break in the egg and beat until all the mixture is combined and it resembles a thick pancake batter. Pour this into prepared tin and bake for 50 minutes-1 hour, until a skewer pushed into the centre of the cake comes out fairly clean. Leave to cool completely in tin before turning cake out. (To freeze: wrap in greaseproof paper, then in cling film. Freeze for up to 1 month.)
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5
To make the icing, mix together icing sugar and lemon zest, then gradually add lemon juice until you have a smooth, slightly runny icing, adding more juice, if needed. Drizzle icing in a zig-zag pattern over surface of cake, turn cake around and drizzle again to create the cross-hatched finish.
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6
Cake keeps for up to 2 weeks stored in an airtight container.
