Method
Preheat your oven to 200°C.
Wash any remaining dirt from your beetroot and pat dry.
Place a large sheet of tin foil on a baking tray (large enough to fold over and cover itself). Place the beetroot onto it and wrap the foil over tightly pinching the edges to reduce air escaping. Roast the beetroot for 1.5-2 hours until the beetroot can be pierced easily with a knife and the skins have slightly shriveled.
Place the cashews on a dry baking tray and in the oven with the beetroot for 7 minutes, tossing half way through and keeping an eye on them to ensure they don’t burn/ Allow them to cool before roughly chopping.
Once cool enough to touch, peel the beetroot and allow them to cool completely before chopping into quarters.
Cook the lentils according to pack instructions and wash your spinach.
Place the coriander seeds in a clean and dry frying pan over a gentle heat and cook for about 5 minute until they begin to release an aroma. Transfer to a pestle and mortar and crush until you have a sandy-like texture. Transfer to a large mixing bowl and add the remaining dressing ingredients. Whisk together with a fork.
Add the lentils, chopped beetroot, chopped cashews, spinach and tarragon. Toss everything together with your hands and transfer to a serving dish.