Roasted portobello mushrooms stuffed with cheese, herbs and breadcrumbs stand in for the traditional Gruyère toast you'd find on top of a crock of French onion soup.
4 tablespoons extra-virgin olive oil, divided
2 tablespoons butter
2 large sweet onions, sliced
1 medium red onion, sliced
4 medium portobello mushrooms, stems and gills removed
½ teaspoon ground pepper, divided
2 tablespoons chopped garlic
2 teaspoons chopped fresh thyme or 1/2 teaspoon dried
¼ cup dry sherry
½ teaspoon salt
4 cups unsalted beef broth
½ cup shredded Gruyère cheese
¼ cup plain dry breadcrumbs
1 tablespoon minced fresh chives
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