Drain liquid for mandarin 11 oz. Can of oranges into large cup and add water to make 1 cup liquid. Bring to a boil in Microwave. Add gelatin. Stir to dissolve. Cool until just warm. Add orange sherbet. Mix to melt. Add whipped cream. Pour 1/3 of mixture into 9x9" glass pan. Add cake cubes to pan. Cover with mandarin oranges and rest of gelatin mixture. Chill. Garnish with more orange segments to serve.
