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

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