To make the sauce, heat the butter in a small saucepan over low heat, stir in the flour and cook 1 min. Add the rest of the ingredients and bring to a simmer to thicken. Set aside.
Whisk together seasoned flour ingredients and set aside.
Whisk together dry batter ingredients. Combine egg and water and add to dry ingredients gradually.
Heat oil to 365F in a deep wok or deep fryer.
Moisten chicken slightly with water. Dip in flour then batter then flour. Fry in the oil for 10 min. or until golden brown and cooked through. Drain on paper towels. Salt immediately again.