Make-ahead gravy - Good Food Middle East

Ingredients

• 1kg chicken wings, halved with kitchen scissors
• the turkey neck, if you have it, cut into pieces
• 3 large carrots, chopped into chunks
• 2 onions, unpeeled and chopped
• 3 celery sticks, chopped
• small handful thyme sprigs
• 2 tbsp sunflower oil
• 2 tsp golden caster sugar
• 1 tbsp tomato purée
• 4 tbsp plain flour
• 4 tbsp balsamic vinegar
• 1 vegetable stock cube