INGREDIENTS
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GRILLED TOMATO KETCHUP:3 pounds Roma tomatoes, cored and halved
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1/2 cup malt vinegar
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1/4 cup sugar
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4 teaspoons kosher salt
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2 teaspoons aji amarillo paste, chipotle in adobo or other spicy pepper sauce, such as Pickapeppa
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1 teaspoon ground allspice
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1 small bay leaf
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1 cinnamon stick
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BURGERS:
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1 medium onion, cut into 1/2 inch rounds, rings separated
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1 yellow bell pepper, cored, seeded, cut into 1/2 inch strips
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Kosher salt
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2 tablespoons vegetable oil
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1 1/2 pounds ground beef
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Freshly ground black pepper
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4 hamburger buns