Put the mixed fruit into a bowl with the whisky and stir well. Cover with clingfilm and leave to absorb the alcohol overnight or at least 4 hours.
Preheat the oven to 180°c/160°c Fan/350°F/Gas 4. Grease and line a spring form tin with baking paper.
Sift the flour, salt, baking powder and ground almonds into a bowl and put to one side.
Put the butter and lemon zest into a large mixing bowl and beat or whisk until the mixture is creamy. Gradually beat in the sugar.
Break the eggs in a separate bowl and beat with a fork. Add the eggs to the butter mixture a bit at a time. Add a tablespoon of the flour mixture with each addition of egg to prevent it from curdling.
Add half of the flour to the mixture and fold in. Fold in half of the fruit, then add the other half of flour and fold in again. Add the remaining fruit mixture and combine until everything is well mixed.
Scrape the mixture into the prepared tin and spread evenly. Make a shallow hollow in the centre of the cake's surface so it will rise evenly. Bake in the oven for 40 minutes, then reduce the oven temperature to 170°c/150°c Fan/325°F, Gas 3 and bake for a further 60 minutes. If it gets too dark during baking, cover the top with baking foil.
Place the tin on a wire rack and leave to cool on the tin. Wrap in fresh baking paper and foil and leave for a few days before cutting.
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