Preheat oven to 300°F. In a roasting pan arrange chicken.
Combine oil, lemon juice, ketchup and honey. Mix well. Brush over chicken.
Reserve any remaining mixture. Cover pan with foil and bake in the preheated oven for 1 hour.
Remove chicken from pan. Place onion, celery, pepper, zucchini, and carrots in the same roasting pan.
Arrange chicken on top of the vegetables.
Pour remaining lemon juice-ketchup mixture on vegetables. Continue baking for 30 minutes.
Remove chicken from the pan. Transfer vegetable to serving dish. Set aside.
Pour pan juice on a saucepan. Stir in dissolved corn starch.
Bring to a boil and stirring constantly until thick. Season with salt and pepper.
Serve chicken with vegetables and sauce on the sides.