Preheat oven to 180grease baba pan well with melted butter.
Beat butter,rind and sugar in small bowl until light and fluffy.beat in egg yolks,cheese and milk.stir in sifted flour.
Beat egg whites in small bowl.until soft peaks;fold in to cheese mixture.
Spread mixture in to pan ; bake about 1 hour.stand cake in pan 5 minutes before turning onto wire rack set over tray.
Meanwhile,make lime syrup.pour hot syrup over hot cake.
Lime syrup:-stir ingrediants in small saucepan over low heat until sugar dissolves;bring to the boil,until syrup thickens lightly.
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