Preheat oven to 375˚
Combine all marinade ingredients in high speed blender till smooth, adding water if needed to thin out
Lift chicken skin on breast gently by sliding fingers under skin. Rub marinade under skin and over entire outside of chicken
In a large roasting pan, place onions in center to act as a "rack" for the chicken
Place chicken on onions
Surround chicken with potatoes and carrots
Roast for approximately 2 hours for a 5 lb chicken. Checking temperature for 165˚ at thickest breast part (less time needed for smaller chicken)
Enjoy!