¼ cup thinly sliced red onion, separated into rings 1 14-ounce can artichoke hearts, rinsed and coarsely chopped 1 medium tomato, seeded and diced 2 tablespoons balsamic vinegar 1 tablespoon extra-virgin olive oil 1 teaspoon dried oregano 1 16- to 20-inch-long baguette, preferably whole-grain 2 slices provolone cheese, (about 2 ounces), halved 2 cups shredded romaine lettuce ¼ cup sliced pepperoncini, (optional)

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