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Preheat oven at 400 degrees.
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Cream the butter, sugar and lemon zest in a mixing bowl.
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Add egg yolks and flour. Beat inches Then add milk and the lemon juice and mix well.
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Whisk egg whites in a separate bowl until stiff (easier when you have a mixer.).
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Add rest of mixture in the egg whites and mix, but do not overmix.
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Pour inot buttered dish (pyrex or such) and stand dish ina roasting pan 1/3 full of water.
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Bake for 45 minutes, or until top is set and spongy and golden.