Homemade ketchup - Good Food Middle East

Ingredients

• 4 good-size onions, very roughly chopped
• 250g celery, very roughly chopped
• 5 tbsp vegetable or olive oil
• 4 garlic cloves, sliced
• 1 tsp ground coriander
• 1 short cinnamon stick
• 1 tsp allspice
• ½ tsp ground black pepper
• 2 tsp celery salt
• 2kg ripe tomatoes, roughly chopped
• 3 tbsp tomato purée
• ½ tsp Tabasco sauce
• 200ml white wine vinegar
• 200g golden caster sugar