Grease and line a 900g loaf tin and preheat the oven to 180°C.
Place the tea bags in a medium-sized saucepan and pour over 300ml just-boiled water. Turn on the heat and simmer for two minutes then lift out and discard the tea bags. Stir in the fruit and muscovado sugar and simmer for another minute then transfer to a large, heatproof mixing bowl.
In a separate bowl, stir together the flour, baking powder, mixed spice, salt and grated orange zest.
Stir the eggs into the cooling tea mix followed by the dry ingredients. Spoon into the prepared tin and bake for one hour (until a skewer inserted in the centre comes out clean).
About 20 minutes before the end of baking time, pare the rind of the reserved orange and cut into thin strips. Heat 25g of the granulated sugar in a small saucepan with the juice of ½ the orange; stir until dissolved. Add the orange strips, leave to cool slightly, then stir in the remaining 25g sugar. Spoon over the cake while still warm in the tin then leave to cool before slicing to serve.
Recipe courtesy of Waitrose
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