Preheat oven to 350 degrees F (175 degrees C).
Mix water, onion, olive oil, balsamic vinegar, Dijon mustard, garlic, black pepper, cayenne pepper, and salt in a roasting pan. Add chicken; turn until well coated with mixture.
Bake in the preheated oven until an instant-read thermometer inserted into the thickest part of the thigh, near the bone, reads 165 degrees F (74 degrees C), about 1 hour and 30 minutes.
foods:
1 cup of water
1 onion chopped
5 tablespoons olive oil
2 tablespoons balsamic vinegar
1 tablespoon Dijon mustard
3 cloves of garlic, crushed
1 teaspoon black pepper
1 teaspoon cayenne pepper
To taste Salt
1 chicken