INGREDIENTS
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2 ounces dried, whole New Mexico (California), guajillo, or pasilla chiles, or a combination (6 to 8 chiles)
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1 1/2 teaspoons ground cumin seed
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1/2 teaspoon freshly ground black pepper
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Kosher salt
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5 tablespoons lard, vegetable oil, or rendered beef suet
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2 1/2 pounds boneless beef chuck, well trimmed and cut into 3/4-inch cubes (to yield 2 pounds after trimming)
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1/3 cup finely chopped onion
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3 large cloves garlic, minced
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2 cups beef stock , or canned low-sodium beef broth, plus more as needed
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2 tablespoons masa harina (corn tortilla flour)
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1 tablespoon firmly packed dark brown sugar, plus more as needed
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1 1/2 tablespoons distilled white vinegar, plus more as needed
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Sour cream
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Lime wedges