Place the oil, diced butternut squash, onion and garlic in a large wok or frying pan which has a lid.
Turn up the heat and once the contents start to sizzle, turn the heat right down and leave to sweat for 10 minutes.
After 10 mins, add the stock to the pan and cook for a further 20-25mins until the butternut squash softens.
Use 3 leaves for each parcel. Use a small one for the middle and 2 larger ones to wrap around.
Remove the stalks from the larger leaves which will be used to wrap around but leave the stalk in the smaller, central leaf. This will stop the mixture from falling out but also allow for easier wrapping.
Add the walnuts to a pan and stir through the Maple syrup. Heat gently for a few mins while continuously stirring.
Once the butternut squash mixture has sweated for 30mins, add the lentils, cumin, coriander, walnuts, peanut butter and salt & pepper seasoning. Stir through.
Spoon a quarter of the mixture in each of the 4 small leaves which still have stalks.
Place these onto 2 larger leaves which are placed end to end, top to bottom.
Envelope the parcels and place a metal skewer to keep them in place.
Transfer to a baking tray.
Bake in the oven for 15-20 mins but keep on eye on the cabbage leaves so they do not turn too brown or burn.
Remove from the oven and remove the metal skewers.
Serve as they are or add some string ties for effect but this is not essential because the parcels should now stay together without any securing.