Combine 3/4 c sugar, matzo cake meal & orange zest in bowl. Beat egg whites and salt in large mixer bowl until soft peaks form. Gradually add remaining 1 cup sugar, 1/4 cup at a time, alternating with orange juice. Beat well after each addition. Continue beating until stiff peaks form.

Fold in matzo meal mixture, 1/4 at a time. Use 15 under-and-over strokes for each addition, slightly turning the bowl after each stroke. Fold an additional 10 strokes.

Pour batter into ungreased 10 inch tube pan. Bake at 325 degrees 50 minutes to an hour, or until cake springs back to touch. Remove from oven, immediately invert pan & cool.