Homemade tomato ketchup

INGREDIENTS

• 1 large red onion, peeled and roughly chopped
• ½ bulb fennel, trimmed and roughly chopped
• 1 stick celery, trimmed and roughly chopped
• olive oil
• 1 thumb-sized piece fresh ginger, peeled and roughly chopped
• 2 cloves garlic, peeled and sliced
• ½ fresh red chilli, deseeded and finely chopped
• 1 bunch fresh basil, leaves picked, stalks chopped
• 1 tablespoon coriander seeds
• 2 cloves
• 1 teaspoon freshly ground black pepper
• sea salt
• 1 kg yellow, orange or green tomatoes, chopped, or 500g cherry or plum tomatoes, halved plus 500g tinned plum tomatoes
• 200 ml red wine vinegar
• 70 g soft brown sugar