INGREDIENTS
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2 tablespoons vegetable oil
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1 small onion, diced
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2 cloves garlic, minced
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2 teaspoons chili powder
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1 pound ground sirloin
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Kosher salt and freshly ground black pepper, to taste
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4 hamburger buns, toasted, for serving
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4 fried eggs, for serving
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Sliced avocado, for serving
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For the tomato sauce:
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1 (15-ounce) can tomato sauce
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3 tablespoons dark brown sugar
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1 1/2 tablespoons red wine vinegar
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1 tablespoon Worcestershire
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1 tablespoon Dijon mustard
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1-2 teaspoons crushed red-pepper flakes
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2 tablespoons tomato paste