Chop the vegetables into bite-sized chunks and scatter in an oven tray, drizzle with olive oil and season. Roast in the oven for 20 minutes or until starting to caramelise.
Remove veg from oven, stir through the Puy lentils and the Harissa paste. Return to the oven.
Now, pan fry the cod in olive oil for a couple of minutes each side until the fish is fully cooked through. The lentils and veg will now be ready too.
Serve with the baby spinach at the bottom of the bowl, topped with the spicy lentils and veg, and top with the pan-fried cod. Dinner in less than 30 minutes!