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Heat the oven to 200C/180C fan/gas 6. Slice the carrots into chunks, or halve lengthways if they are small, and quarter the parsnips lengthways. Toss with the harissa and ½ tbsp oil and season. Tip onto a baking tray and roast for 40-45 mins or until tender. Toss the spinach and 1 tbsp of water through for the last 5 mins to wilt.
Blitz the remaining oil, the coriander, mint, garlic and nuts in a food processor until smooth – add 1 tbsp water if needed. Season and stir in the lemon zest and juice.
Warm the lentils through in the microwave or in a pan with a few tablespoons of water, then toss with the roots and spinach. Spoon into bowls and top with the herb pistou.
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