INGREDIENTS
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Mayonnaise
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2 tablespoons grated white onion
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1 Hass avocado, pitted and peeled
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2 tablespoons mayonnaise
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2 plum tomatoes, cored, seeded, and chopped
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1 tablespoon finely chopped fresh cilantro leaves
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2 teaspoons fresh lime juice
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1 small garlic clove, grated
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Kosher salt
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2 poblano chile peppers
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1½ pounds ground chuck (80% lean)
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1½ teaspoons kosher salt
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1 teaspoon freshly ground black pepper
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4 hamburger buns, split