Heat oven to 350 degrees.
Line with foil and grease or vegetable spray an 18" x 9" pan cake pan.
Spread popcorn on foil in pan.
In a deep 16-24 oz micro-proof cup or bowl, stir together corn syrup, sugar and water.
Heat sugar mixture in microwave on high for 1 minute.
Gently Stir.
Microwave again 1 minute and stir.
Microwave 30 seconds more till syrup is foamy. Syrup will be extremely hot. Use caution in handling.
Quickly and thinly drizzle syrup evenly over popcorn.
Sprinkle with 2 T. additional sugar.
Sprinkle with coarse salt if desired.
Bake in oven for 5 minutes.
Stir with large spoon and bake 3- 5 more minutes. Do not allow popcorn to scorch.
Remove from oven and flip onto wax paper or baking parchment.
Cool completely and break apart before serving. 6 servings.