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Preheat oven to 160°C. Grease and line a 8 inch round cake tin or simply grease a 2.4 litre/10 cup bundt tin. I prefer the latter and use an aerosol spray of rapeseed oil.
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Cream the butter and sugar until much increased in volume, pale and fluffy.
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Beat in the first two eggs one at a time then sift over the flour and raising agents and beat in with the final egg to prevent curdling.
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Add in the yogurt and vanilla, barely stir through.
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Add the apple and nuts and mix until everything is fully amalgamated then stop.
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Spoon gently into the cake tin and flatten the surface.
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Bake for 60 minutes no higher than the middle shelf of the oven, check at 50 minutes if your oven runs hot. NOTE – the sugar content and eggs will mean it browns quickly but on the low a temp it should not burn; you want the cake to be well risen, just coming away from the sides of the tin and for it to spring back if gently pressed in the centre.
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Cool in tin for a good 30 mins then unmould and place carefully with the help of your biggest flat spatulas/cake lifter (if you have one) onto a serving plate, if serving warm. If not cool fully on a rack before glazing.
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To make the glaze, melt the butter, sugar and a splash of water and bring to a bubble until well thickened (5-10 mins of stove side attention required); take off the heat, stir in the double cream (which will sizzle and bubble more) then return to the heat and bring back to a bubbly, thickened texture.
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Cool a few minutes then paint and pour over the cake helping it spread with a pastry/silicone brush.
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Leave until the surface just sets before slicing and serving.