1 1/2 cups egg whites (from about 1 dozen eggs), at room temperature
1 1/4 teaspoons cream of tartar
1/2 teaspoon salt
1 1/2 cups sugar
2 to 3 teaspoons hot water
1 tablespoon instant coffee or espresso
1 1/8 cup sifted cake flour
1 teaspoon pure vanilla extract
Glaze:
1/4 cup espresso
8 ounces confectioners' sugar, sifted
Serving Suggestion: Vanilla frozen yogurt