Roast Chicken with Gravy

WHAT YOU'LL NEED

• 1.4– 1.6 kg (3–3½lb) chicken, cleaned
• 3 tablespoons olive oil
• Zest of 1 lemon
• 1 clove garlic, crushed
• 1 tbsp freshly chopped herbs, e.g. thyme,, parsley
• 1 onion, halved
• Freshly ground black pepper
• 1 Knorr Chicken Gravy Pot