"Once a way to make use of stale tortillas (by toasting and/or frying them), tostadas are so good that it wasn't long before people simply started using fresh tortillas. After biting into these layers of flavor?crunchy, creamy, luscious?you'll see why...."
INGREDIENTS
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1 medium white onion
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1 pound tomatoes, quartered
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2 large garlic cloves
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1 or 2 fresh serrano chiles, stemmed
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1/2 cup plus 2 tablespoon vegetable oil, divided
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3 cups shredded iceberg lettuce
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6 large radishes, halved and sliced
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1/2 cup chopped cilantro, divided
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1 rotisserie chicken, meat coarsely shredded (4 cups)
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6 (6-inch) corn tortillas
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1 (1-pound) can refried beans, heated
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1 avocado, halved, pitted, and peeled
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1/2 cup Mexican crema or sour cream
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1/4 cup crumbled queso añjo (aged white cheese, also called cotija) or ricotta salata