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Bring a pan of salted water to the boil. Add the bay leaf and lentils, and cook for 12-15 mins until the lentils are tender but still have some bite. Drain, put in a bowl with 1 tbsp olive oil and the lemon juice, then combine.
Melt the butter in a heavy bottomed frying pan or skillet that has a lid, along with the sage and remaining oil. Add the squash and some seasoning, then stir to coat them in the butter. Put the lid on and cook over a medium heat for 8-10 mins or until just tender, adding a splash of water if you need to stop it catching.
Add another splash of water to the pan along with the kale. Put the lid on to steam for 3-4 mins until the kale is tender. Put the lentils on a serving platter and arrange the squash and kale on top. Garnish with the parsley and hazelnuts and squeeze over 1 tbsp lemon juice from the remaining lemon wedges, to serve.