1. Line a 9 x 5-inch loaf pan with plastic wrap; coat plastic with cooking spray. Place 1 1/4 cups sugar, fruit concentrate or puree, applesauce, and corn syrup in a saucepan; bring to a boil. Cook until a thermometer registers 224° (about 10 minutes). Add pectin; bring to a boil. Cook 1 minute, stirring frequently. Remove from heat. Stir in lemon juice. Pour mixture into prepared pan; cool. Cover; let stand at room temperature overnight.
2. Sprinkle top evenly with 1 tablespoon sugar. Invert gelée onto a cutting board. Discard plastic. Cut into 32 pieces. Place remaining 3 tablespoons sugar in a shallow dish; gently roll gelées in sugar.