This Roasted Portobello Mushroom Blat with Pesto Sauce is a delicious and satisfying vegetarian sandwich option. The meaty portobello mushrooms are roasted to perfection and paired with creamy avocado, crispy bacon, and tangy tomatoes. The pesto sauce adds a burst of flavor and brings all the ingredients together. It's a hearty and flavorful sandwich that is perfect for lunch or dinner.