1.Toss the fish in combined flour, salt and pepper; shake away excess. Heat butter and oil in a large, non-stick frying pan; cook fish until browned on both sides and just cooked through. Drain fish on absorbent paper.
2.Meanwhile, to make celeriac remoulade, trim celeriac and peel thickly. Grate coarsely until you have 200g. Combine grated celeriac with the remaining ingredients in a medium bowl; season to taste with salt and pepper.
3.Serve the fish with the celeriac remoulade, spinach leaves and lemon wedges, if desired.
Not suitable to freeze. Not suitable to microwave.
Note
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