Heat oven to 400. Make a well in center of flour; add egg yolks, 1/2 cup sugar, salt & butter. Work with hands until well blended. Press dough into ungreased square pan, 9*9*1 3/4". Bake 15-20 minutes. Cool slightly; spread with jam or jelly. Beat whites until foamy.
Gradually add 1/2 cup sugar & cinnamon. Continue beating until whites stand is stiff peaks. Spread meringue over jam. Bake 8-10 minutes.
