Preheat oven at 390F
Use a fork and poke many holes on eggplant pieces. Lightly salt eggplant with salt.
In a shallow pan/pot, pour in 2 cups of vegetable oil. Heat oil to 350F-375F.
Quickly blanch cut eggplant in hot oil for 30 seconds for each piece, or under 1 minute if cooking in small batch. Do not stuff all of them at once. Take time and blanch.
Lay blanched eggplant pieces on big plates that has been lined with oil absorbing cooking oil.
Wait for 1-2 minutes for eggplant half cool down. Then carefully transfer them to baking pan (lined with aluminum foil) and grilled in the oven for 10 minutes.
After 10 minutes, check the texture of eggplant by using a fork and carefully scoop out piece of eggplant. If it's still dense, return the eggplant to the oven and cook for another 5 minutes.
Make scallion garlic soy sauce:
In a small sauce pan, heat 2 tbsp of vegetable oil until hot. Then add chopped scallion, turn off the heat immediately. Constantly stir scallion to coat it thoroughly with hot oil.
In a small bowl, combine the rest of of the sauce ingredients and mix well.
Then gradually add one tbsp of scallion oil once at a time into soy sauce mixture. Adjust the amount of of scallion oil inside the soy sauce according to your references.