Combine soy sauce, sherry wine and sesame oil in a bowl. Add the sliced chunks of chicken. Mix it all in, cover then store in the fridge for an hour or two. Heat up oil in a small pot or fryer. Whisk together a beaten egg, cornstarch, flour, baking powder, water, salt and pepper. Dip the marinated chicken chunks into the batter. Do this in batches.
Fry the battered chunks of chicken into the hot oil until golden brown. Do this in batches as well. Drain the oil of the fried chicken using a strainer with a pot or bowl underneath.
In a non-stick pan, whisk together ketchup, honey, sugar, water, vinegar, cornstarch, sesame oil, and sprinkle of sesame seeds. Add more water if necessary. Keep whisking until sauce is thickened.
Add the deep-fried chunks of chicken into the sauce. Gently stir everything together. Transfer into a serving platter. Sprinkle with more sesame seeds and chopped scallions for garnish.
