Herb butter roast chicken with miso onion gravy

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• 100g/3½oz butter
• 50g/1¾oz miso paste
• 1 tsp sugar
• 1 tsp dark soy sauce
• small handful rosemary, leaves and stems reserved
• small handful sage, leaves and stems reserved
• ½ lemon zested
• 1 medium chicken
• 2 large onions
• 1 garlic bulb
• 50g/1¾oz butter
• 250ml/9fl oz white wine
• 1 tbsp vegetable oil
• 1 tsp plain flour
• 200ml/7fl oz chicken stock
• 1 tsp chicken gravy granules
• ½ lemon juice only
• salt and freshly black pepper