It's a good choice at any time of year. Winter is upon us, which means, soup season is upon us. Snow, ice, wind, cold. To make a vegetarian french onion soup, we have to use vegetable stock. Add onions, chopped scallions, thyme sprigs, and bay leaf. 8 tablespoons (90g) unsalted butter (you could use olive oil, but the taste won’t be the same) 4 large shallots, 24 small red onions and 8 yellow onions (if you only use one type of onion, plan on 3lbs of yellow onion for this recipe) Kosher salt and freshly ground black pepper. Melt butter in a medium pot over medium-high heat. This vegetarian French Onion Soup is made with chunky portobello mushrooms for meaty flavor and texture in a vegetable-based broth. Toss your onions with flour. Soup is the most comforting and satisfying meal. In a dutch oven or deep soup pot, melt butter and olive oil and sweat your onions and garlic for about 15 minutes. French Onion Soup Ingredients. There's really no such thing as "soup season" in my world. This simple yet hearty dish is typically made with beef stock, leaving vegetarian s out in the cold. Season with salt and pepper. French onion soup is generally not a vegetarian dish- it’s traditionally cooked in beef stock. French onion soup is a classic go-to warming technique. Cook, stirring frequently and gradually lowering heat to prevent scorching, until onions are soft and golden brown, about 20 minutes. Directions. Next, add your thyme, 1 bay leaf, balsamic vinegar and white wine and let reduce and caramelize for about 1 hour. Portobello Mushroom French Onion Soup. Stir in … But then you have a lighter colored soup and it really lacks the depth of flavor that the original has. Vegetarian French Onion Soup.