Steam or gently boil the beets about 15 minutes. When done, grate them on the coarse side of a grater. Remove the seeds from the cucumbers. Grate on the coarse side of the grater. Chop the green onions. Juice the oranges and grate the rind of 3 oranges. Put the beets, cucumbers, orange rind and juice and 2 cups cold chicken stock into a large mixing bowl. Puree in a blender, in batches, until smooth. Chill for at least 3 hours before serving. Add more chicken stock to correct the consistency after chilling. To serve, ladle into chilled soup bowls. Garnish with salted whipped cream or sour cream.