Wash (and peel, if desired) and cut the eggplant into bite-size cubes. Place the eggplant pieces in a bowl and sprinkle the salt over them. Toss to distribute, and let sit for 15 minutes.
To a small bowl, add the soy sauce, vinegar, water, sweetener, and xanthan gum. Whisk until the sweetener has dissolved. Set the bowl aside.
Add 2 tbsp of oil to a large skillet and place it over medium-high heat. Drain the eggplants of excess water by pressing with your palm while discarding the liquid. Once the oil is hot, add half the eggplants and fry for 5-8 minutes until golden and soft. Repeat with the second batch.
Place the fried eggplant onto a plate and add the remaining oil. Finely chop the garlic and chili and add them to the skillet. Cook for 1-2 minutes while stirring until fragrant.
Return the fried eggplant to the skillet and pour the sauce. Stir immediately and bring the sauce to a simmer. Drop the heat to medium-low and let the sauce thicken.
Take the eggplant off the heat and transfer to a serving plate. Finely chop the scallions and sprinkle them on top. Garnish with sesame seeds and serve immediately.