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          100 g/4 oz/0.5 cup butter or margarine, 
          softened 
          100 g/4 oz/0.5 cup caster (superfine) sugar 
          1 egg, separated 
          225 g/8 oz/2 cups plain (all-purpose) flour 
          5 ml/1 tsp baking powder 
          5 ml/1 tsp grated lemon rind 
          50 g/2 oz/0.5 cup flaked (slivered) almonds 
          Caster (superfine) sugar for sprinkling  | 
        
        
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          Method: 
          
          Cream together the butter or margarine 
          and sugar until light and fluffy. Gradually beat in the egg yolk, then 
          work in the flour, baking powder and lemon rind, finishing with your 
          hands until the mixture binds together. Roll out to 5 mm or 1/4 in 
          thick and cut into 6 cm or 2 1/4, in rounds with a biscuit (cookie) 
          cutter, then cut out the centers with a 2 cm or 3/4 in cutter. Place 
          the biscuits well apart on a greased baking (cookie) sheet and prick 
          them with a fork. Bake in a preheated oven at 180°C/350°F/gas mark 4 
          for 10 minutes. Brush with egg white, sprinkle with the almonds and 
          sugar, then return to the oven for a further 5 minutes until pale 
          golden. 
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