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Heat 1 tbsp of the oil in a frying pan. Tip in the onion, garlic and chilli flakes and cook over a low heat for 10 mins until soft. Add the tomatoes and ¼ can of water and cook for 8 mins until thick, then stir through the capers and olives. Can be done earlier in the day and chilled.
Meanwhile, heat oven to 220C/200C fan/ gas 7. Put the celeriac on a non-stick baking sheet. Add another 1 tbsp oil, season and mix with your hands. Spread into a thin layer and roast for 25 mins, stirring once, until golden and tender.
Put the kale in a steamer and cook for about 5 mins until tender. When done, pop a knob of butter on top, squeeze over a little lemon juice and season.
Heat the remaining oil in a non-stick frying pan. Season the fish fillets, then put in the pan, skin-side down. Cook for 3-4 mins until the skin is golden and the fish is almost cooked through. Turn and cook for 1-2 mins more, depending on the thickness of the fillets.
Meanwhile, heat the sauce through, season and add the parsley. Spoon the sauce onto 2 plates, top with the fish and serve with the celeriac chips and kale.