Ultimate vegan gravy - Good Food Middle East

Ingredients

• 6 large portobello mushrooms
• 3 onions, unpeeled, quartered
• 4 carrots, unpeeled, roughly chopped
• 3 celery sticks, roughly chopped
• 1 garlic bulb, halved
• 2 tbsp sunflower oil
• 2 tbsp agave syrup
• 2 tbsp red wine vinegar
• 2 tbsp tomato purée
• 2 tbsp soy sauce
• 100g plain flour
• 25g dried mushrooms
• 150ml ruby port
• 2 litres vegetable stock
• 3 bay leaves
• small bunch of thyme