This delicious burger-like vegetarian sandwich tastes as good as it looks. Arugula adds a nutty, peppery note.
1 large sweet onion, sliced about 1/4-inch thick
Separate onion slices into rings; toss with 1 tablespoon olive oil. Season well with salt and pepper; spread out on a baking sheet. Brush mushrooms on both sides with olive oil; season well with salt and pepper. Put on a baking sheet. Bake vegetables at 500 degrees F until onions just begin to brown and mushrooms are tender and lightly browned, about 10 minutes. Meanwhile, spread 1/2 tablespoon mayonnaise on cut sides of each roll. When vegetables are done, layer 1/4 cup roasted peppers, 1 mushroom, one fourth of the onion slices, and one fourth of the cheese slices on the bottom of each bun. Top with several leaves of arugula (optional) or other leafy green; cover with top of bun. Return to hot oven; bake until cheese melts, about 3 minutes.
Yield: 4 servings
©Oso Sweet Onions