1. To clean squid, remove tentacles and all parts inside tubes, including head, beak and quill,then rinse well. Reserve tentacles for another use. Cut tubes into 2 cm pieces. Set aside.
2. Put carrot, onion, celery, lentils and bay leaf into a saucepan. Cover with the cold water,then simmer over low heat until lentils are tender, approximately 40 minutes. Drain,removing and discarding vegetables.
3. Place extra virgin olive oil in a large frying pan over high heat. Add squid and fry for 3 minutes or until golden brown, then add all the greens and cook for 1 minute or until wilted. Add lentils, tomato and chick peas and fry for another 1 minute. Add sherry vinegar and drizzle with a little more extra virgin olive oil.
4. Season to taste with sea salt, then scatter with mache, if desired. Transfer to plates or shallow bowls and serve.