Fresh mushrooms are sliced and marinated with balsamic vinegar for this simple, oil-free salad. Creamy cannellini beans make this a hearty recipe. This is the perfect cold dish for a summer picnic. Or, enjoy it as a simple side with your favorite Italian plant-based recipes like Vegan Butternut Squash Italian Polenta, French Socca – Gluten-Free Chickpea Flatbread Pizza, or Plant-Based Portobello Mushroom Lentil Bolognese.