This recipe creates a hearty, flavorful vegetarian bake featuring tender white beans, sweet leeks, earthy mushrooms, and aromatic celery simmered in a rich tomato and red wine sauce. Baked until bubbly and served with crisp multigrain toast, it's a comforting and substantial main course perfect for a family meal.
Thoroughly clean leeks by slicing them and rinsing under cold water to remove any grit. For deeper flavor, ensure mushrooms are well-browned before adding other liquids; this develops a rich umami base. When simmering the sauce, allow the red wine to reduce completely to concentrate its flavors and burn off alcohol. Adjust seasoning at the end, as the vegetable stock and pasta sauce already contain sodium. For a crispier topping, consider adding a sprinkle of nutritional yeast or dairy-free Parmesan to the toasted bread before serving.