Sift flour and salt together. Beat egg whites until stiff but not dry. Beat yolks until thick, add honey gradually and beat until well blended. Add lemon juice. Add flour gradually to yolk mixture. Beat 5 minutes. Fold in stiffly beaten whites. Pour about 1/2 inch deep in 1 or 2 small shallow oblong baking pans, which have been greased on bottom only. Bake in slow oven 325F 20 to 30 minutes. Turn onto towel which has been sprinkled with confectioners sugar and trim off crisp edges. Spread with jam. Roll.