INGREDIENTS
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1 tablespoon olive oil
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2 red bell peppers
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1 large onion
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3 cloves garlic
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2 pounds lean ground beef
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1 (29-ounce) can tomato sauce
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1/4 cup brown sugar
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3 tablespoons cider vinegar
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3 tablespoons tomato paste
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2 tablespoons Worcestershire sauce
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1 teaspoon chili powder
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Kosher salt and freshly ground black pepper
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3 hamburger buns
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1 tablespoon butter
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Coarse salt
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1 ripe avocado