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To begin, make the fish soup base. Add the fish bones to a large roasting tin with the onion, fennel, leek, celery, garlic, fennel seeds, coriander seeds, star anise and olive oil. Roast for 15 minutes then stir in the tomato paste and roast for a further 10 minutes. Remove from the oven and deglaze the tray with the white wine, scraping the bottom to remove any residue