Dice 6 slices bacon. Fry diced bacon along with the 6 whole slices in a heavy skillet. Remove whole slices to drain on paper towels; set aside.
Combine sugar, cornstarch, salt, vinegar, and water; slowly add to diced bacon and bacon grease in the skillet, cooking and stirring constantly over medium heat until thickened.
Pour over hot potatoes and eggs; add green onions and toss lightly to mix.
Garnish with bacon slices and a little chopped parsley. Serve hot.