Preheat oven to 180°C. Put butter and sugar in a bowl and beat until light and fluffy. Gradually beat in egg. Add flour, ground almonds and orange rind and fold into the mixture. Fold in orange juice. Spoon the batter to paper cases. Bake cupcakes in the preheated oven until well risen and golden brown. Topping making; squeeze orange to get the juice. Put the rind, juice and sugar in a pan and heat gently until sugar has dissolved. Simmer for 5 minutes. Prick cupcakes all over with a skewer. Spoon the warm syrup and rind over each cupcake. Then sprinkle slivered almonds on top.
