8 to 10 servings
Line a lightly oiled 6 1/2-cup ring mold with cucumber slices. Set aside.
Dissolve gelatin in water; add vinegar, food coloring, and salt, stirring well. Chill until the consistency of unbeaten egg white. Fold in cucumbers, and next four ingredients; spoon into prepared mold. Chill until firm.
Unmold, and garnish with parsley and cherry tomatoes. Serve with sour cream, if desired.