Arepas are small, corn-cake sandwiches with fillings such as prosciutto, cheese and caramelized onions; sautéed vegetables and cheese; and pulled pork, cheese, caramelized onions and cabbage.

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In a small skillet, heat the remaining 2 teaspoons of olive oil. Add the sliced onion and cook over moderate heat, stirring, until softened, about 3 minutes.