Economy Sponge Cake

1 1/4 cups          sifted cake flour
1 1/4 teaspoons     baking powder
1/2 teaspoon      salt
1      cup           sugar
2                    Eggs — beaten until thick
– and light
1      tablespoon    lemon juice
5      tablespoons   boiling water

Sift flour once, measure, add baking powder and salt, and sift together
three times.

Add sugar gradually to beaten eggs, beating well.