Marinate chicken: In a bowl, evenly combine the chicken with 1 tablespoon light soy sauce, 1 teaspoon cooking wine, and 1 tablespoon cornstarch. Set aside and let it marinate for 20 minutes.
Heat vegetable oil in a large wok over medium-high heat, enough to cover 3 inches deep. You can use a candy thermometer to make sure it reaches deep-frying temperature (350 to 375 degrees F). This will take a few minutes.
Make the batter: In a bowl, whisk the ⅓ cup cornstarch, ¼ cup all-purpose flour, ¼ teaspoon baking powder, and ½ teaspoon salt. Next, slowly add the COLD soda water, whisking to combine until a relatively thin batter forms (kinda like a thin pancake batter). Set aside.
Then, dredge each piece of the marinated chicken in the ¾ cup of cornstarch (use a shallow bowl), and then dip each piece in the wet batter, shaking off any excess. Drop into the hot oil to deep fry, one by one. Do it in batches to not overcrowd the pan. Deep fry for about 6-8 minutes, giving it a quick stir occasionally, until golden brown and cooked through in the center.
Transfer to a plate lined with paper towel to drain any excess oil.
Make the honey sesame sauce: In a bowl, mix the ⅔ cup chicken broth, ⅓ cup honey, 2 tablespoons soy sauce, and 1 teaspoon rice vinegar. Add the sauce into a large skillet and bring to a low simmer, about 1 minute. Next, slowly add the cornstarch slurry and simmer for a few seconds until thickened. Finally, add the sesame oil to taste.
Add the crispy chicken back and toss with sauce to coat evenly. Garnish with sesame seeds and sliced scallions. Enjoy!