Roast Chicken with Rosemary and Lemon

Bahan-bahan (4 porsi)

• 1 (3 lb) chicken, washed and dried, fat removed
• 1/2 onion (chopped in large chunks)
• 2 cloves garlic (smashed)
• 1 lemon (halved)
• 3 sprigs fresh rosemary
• 1 tbsp dried herbes de Provence (or dried rosemary)
• kosher salt and fresh pepper