Mix sugar and gelatin in 3-quart saucepan; stir in wine, orange juice concentrate, water and lemon juice. Heat to boiling, stirring constantly. Boil and stir 1 minute. Remove from heat. Stir in lemon peel. Refrigerate until mixture mounds slightly when dropped from spoon, about 2 1/2 hours. Fold chilled gelatin mixture into whipped cream. Pour into 7-cup mold. Refrigerate until firm, about 12 hours. Unmold and garnish with orange slices.