Chef John's Chicken Tinga
Ingredients:
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3 pounds skinless, boneless chicken thighs
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3 peeled whole garlic cloves
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1 large yellow onion, halved
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2 teaspoons kosher salt, plus more to taste
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½ teaspoon dried oregano
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4 cups chicken stock
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1 cup water
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2 tablespoons olive oil
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1 large onion, diced
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1 (7 ounce) can chipotle peppers in adobo sauce
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1 (28 ounce) can peeled plum tomatoes (preferably San Marzano)
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2 tablespoons crumbled cotija cheese, or to taste
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3 tablespoons chopped fresh cilantro, or more to taste