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Heat oven to 200C/180C fan/gas 6. Put each fish fillet on a large piece of baking parchment and top each with a few slices of lemon and a sprig of thyme. Drizzle with 1 tsp of the oil and season. Fold over the top edges of each piece of parchment to make a seal, then scrunch up the ends like a sweet wrapper. Put the parcels on a baking sheet and bake in oven for 15 mins.
Meanwhile, steam the cauliflower for 4 mins, then add the spring onions for 3 mins more or until tender. Pat dry, then toss the veg in 2 tsp olive oil and season. In a large frying pan, toast the bread pieces in the remaining oil, then add the chilli and garlic, and cook for 1 min. Tip into a food processor with the nuts, peppers, tomato and vinegar, and pulse until you have a rough paste. Season and put to one side.
Wipe then heat the frying pan. Add the cauliflower wedges and spring onions, and cook for a few mins each side to brown. Serve alongside the fish and sauce.