Preheat the broiler. Put the poblano on a baking sheet and broil, turning, until charred in spots, about 8 minutes. Transfer to a plate and let cool. Reduce the oven temperature and bake the onion rings as the label directs. Season with salt, pepper and 1/4 teaspoon each chili powder and cumin.
Meanwhile, combine the ketchup, cilantro, a pinch of lime zest and half of the lime juice in a small bowl; add more lime juice and salt and pepper to taste. Refrigerate until ready to use.
Mix the ground beef, 1/2 teaspoon lime zest and the remaining 1 3/4 teaspoons chili powder and 3/4 teaspoon cumin in a large bowl with your hands until just combined. Form into four 3/4-inch-thick patties; season both sides with salt and pepper. Heat the vegetable oil in a large nonstick skillet over medium-high heat. Add the burgers and cook until browned, 2 to 3 minutes per side for medium rare.
Peel, stem and seed the broiled poblano; cut into strips. Place the burgers on the buns with the ketchup sauce, lettuce and poblano. Serve with the onion rings and the remaining ketchup sauce.
Tools You May Need
Photograph by Ryan Dausch
Tools You May Need
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