Mix egg white and water in a bowl large enough to fit the chicken thighs. Add chicken, turn to coat both sides and let stand 10 minutes.
Put the flour, baking soda, and cayenne in a clean paper bag. Add the chicken and shake vigorously so all the chicken gets coated.
Put the chicken in an 8-inch baking dish and put the dish in your air fryer. Set the air fryer for 400 F/ 204 C and bake for 20 minutes or until the chicken reads 160 F / 71 C on an instant-read thermometer.
While the chicken is in the air fryer, make the sauce. Mix the chicken base with the hot water and set aside. Mix the cornstarch and cold water in a small bowl and set aside.
Put the remaining ingredients in a small saucepan. Add the hot base mixture, turn the heat on, and mix thoroughly. Cook until all the sugar has dissolved and the mixture is hot. Set aside until the chicken is done.
Prepare the garnish by slicing the green onion on the diagonal and the lemon thinly.
When the chicken is done, take it out of the oven and plate it. Add the cornstarch mixture to the sauce and stir until the sauce has thickened. Pour the sauce over the chicken and garnish with lemon slices, green onion, and sesame seeds. Enjoy!
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