Add flour and mix alternately, beginning and ending with flour. Add flour in four portions, milk in three. Mix after each addition at lowest speed until just blended. Beat one minute at medium speed after last addition of flour.
If mixing by hand, stir after each addition until just blended. Beat 35 strokes after first three additions of lfour After last addition of flour, beat 70 strokes.
Beat egg whites until they begin to hold a peak that stands straight up when beater is gently lifted. With a wooden spoon, fold egg whites into mixtures; use 30 to 40 strokes.
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