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Preheat oven to 350.
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In small saucepan, heat lime juice and water until bubbles form around edge of pan.
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Remove from heat; set aside.
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Sift flour with baking powder and salt; set aside.
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In small bowl of electric mixer, at high speed, beat eggs until thick and light yellow.
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Gradually add sugar, beating until mixture is smooth and well blended, about 5 minutes(it will get thicker when you add sugar).
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At low speed, blend in flour mixture just until smooth.
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Add lime juice/water and lime zest, beating just mixed.
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Pour batter right away into ungreased 9 inch angel food cake pan.
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Bake 30 minutes, or until cake tester inserted in center comes out clean. Trace edges of pan with a knife and turn pan over onto serving plate; let cool completely.