In this recipe, portobello mushrooms are layered with grilled onions, blue cheese, and romaine lettuce for a little crunch, then smeared with a special sauce made with yogurt, Dijon, herbs, and garlic. With their meaty texture, portobellos make ideal vegetarian burgers and sandwich fillers. You may be surprised to learn that portobellos (cappellone, or “big hats,” in Italy) are actually oversized cremini mushrooms. Though they are easy to make indoors, we suggest grilling the onions and mushrooms for a nice smoky flavor.

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