Beat castor sugar and butter till light and fluffy. Add in grated lemon skin, lime juice and egg, and beat till even.
2
Sift together flour, baking soda and salt evenly. Add flour mixture to the mixture of butter-sugar alternately with yogurt. Mix evenly after every addition.
3
Add 1 spoon of biscuit mixture to baking tray placed with baking paper. Leave some room for the biscuit to expand.
4
Bake in oven at 180ºC for 15 – 20 minutes or until biscuits turn brownish. Leave to cool on wire rack.
5
In a small bowl, mix icing sugar, lemon juice and granulated lime skin with a small beater.
6
Spread lemon icing on top of biscuits, and allow it to harden.