Stark parsnipssoppa

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1. 1
   Heat oven to 220C/fan 200C/gas 7.
2. 2
   In a bowl, mix together 2 tbsp olive oil and 1 tsp coriander seeds, 1 tsp cumin seeds, ½ tsp ground turmeric and ½ tsp mustard seeds.
3. 3
   Add 1 large onion, cut into 8 chunks, 2 garlic cloves, 675g parsnips, diced, and 2 quartered plum tomatoes and mix well.
4. 4
   Spread over a heavy baking sheet, then roast for 30 mins until tender.
5. 5
   Spoon into a food processor or liquidiser with 600ml vegetable stock and process until smooth.
6. 6
   Pour into a pan with the remaining  600ml vegetable stock, season, then heat until barely simmering.
7. 7
   Remove from the heat and stir in 1 tbsp lemon juice. Garnish with cumin seeds.