Heat oil in a skillet set on medium high. Add chicken pieces and brown until golden in color. Remove the chicken from the pan and drain the excess liquid out.

To skillet add the onion, garlic, more oil, lemon juice, lemon rind, ketchup, brown sugar, dry mustard, curry powder, wine vinegar, soy sauce, salt, and pepper. Stir rapidly, scraping at the bottom so the browned bits flavor the sauce. Return chicken to pan.

Lower the heat to low and simmer uncovered until cooked through, about 20-30 minutes.