Heat oven to 220C/200C fan/gas 8. Cut two squares of baking parchment slightly bigger than the cod and place a fillet in the centre of each one. Divide 20g of the butter between the two fillets and top with a few thyme leaves and lemon slices. Season generously. Fold and scrunch the paper together to create two paper parcels. Put on a baking sheet and cook for 8-10 mins.

Meanwhile, heat a medium-sized frying pan over a high heat and fry the pancetta for a few mins until golden and crisp. Add the remaining butter and cabbage, then cook for 5 mins or until the cabbage has softened. In a small saucepan over a low heat, lightly mash the butter beans with a potato masher, then mix the beans through the buttery cabbage and pancetta mixture. Stir through the cream to loosen and season generously. Serve the fish with the creamy colcannon.