Seasonal, simple and absolutely delicious. This vegetarian/vegan-friendly recipe features sweet roasted pumpkin and grilled juicy portobello, for a meal that any meat-lover will love. It's Meatless Monday, and it's the perfect time for this juicy steak-like grilled portobello mushroom with roasted pumpkin mash and caramelized walnuts. But first, what is meatless monday exactly about? It's an international campaign founded in