In a large heavy-bottomed pot, pour oil in enough to fill the pot about a third of the way. Heat over medium heat until a deep-fryer thermometer inserted into the oil reaches 350 degrees.
Line a sheet tray with a wire rack. Slice chicken into 2-inch pieces. In a bowl, whisk together eggs, cayenne pepper, salt and black pepper to taste. In a paper bag, shake together salt, pepper, flour and cornstarch.
Dip the chicken in batches, first in egg mixture, then in the flour mixture and shake to coat. Set on wire rack and let sit for 10 minutes. While chicken is resting, prepare sauce. In a large straight sided saute pan combine orange zest, orange juice, brown sugar, butter, hot pepper flakes and worcestershire sauce.
Stir; bring to a boil, then reduce heat and simmer until thickened, 5 to 8 minutes. Carefully place chicken in hot oil and fry until golden and crispy, 5 to 8 minutes. Transfer to the saute pan with the sauce and toss until evenly coated. Remove to a serving platter and serve on rice.