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Place the sliced tomatoes on a flat pan greased with olive oil. Drizzle the tops with a little olive oil, salt and pepper, and balsamic vinegar.
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On the broil setting, bake the tomatoes in the oven for about 12-15 minutes, checking occasionally to make sure the tomatoes aren't sticking.
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Place a few basil leaves on each slice of the bread. Add the roasted tomatoes and top with mozzarella.
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Grill on a panini or foreman grill for several minutes until the cheese has melted.