Pre-heat the oven to 190 degrees C. To prepare the squash, lay each on its side and carefully cut 1 and ½ inch thick slices. Using a small cookie cutter, cut a circle in the centre of each round to create a ring. It may take some grunt to push the cutter through and the rings may break; no matter. Discard any seeds and cut the inside round in to cubes.
Place the squash rounds in a roasting pan and drizzle with olive oil. Season with sea salt and place in the oven for 20 minutes.
Meanwhile, heat the olive oil in a large skillet or fry pan and add the garlic, onion and fresh thyme leaves. Sauté for around four minutes or until soft.
Add the chestnuts, cherries, squash cubes and the butter and cook until the butter is melted before adding a pinch of nutmeg. Stir well.
Finally, add the cooked quinoa and the drained lentils and continue to cook for another five minutes before stirring in the baby spinach. Season with sea salt to taste and a good crack of black pepper and when the spinach has wilted remove the stuffing from the heat.
Keeping the oven on, take the partially cooked squash rings from the oven and place them on your kitchen counter. Carefully, fill each ring with a good amount of stuffing, drizzle each with a small amount of olive oil before placing them back in the oven for a further 20 - 30 minutes or until the squash is cooked through.
Remove from the oven and serve with a vegan gravy and sides.