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Preheat oven to 325 degrees f.
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Line bunt pan with parchment paper.
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Mix 3/4 C sugar and sifted flour together. Set aside.
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Mix egg whites on medium speed until just fluffy (about 1 minute).
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Add cream of tartar.
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Continue to mix until egg mixture forms soft peaks (about 5 minutes).
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Mix in remaining 3/4 C sugar, salt, lemon juice and vanilla.
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Sift flour mixture into egg mixture gradually, blending with a spatually after each addition.
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Pour batter into lined pan.
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Bake for 50 to 60 minutes until cake is lightly browned and springs back at touch.