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1. Place peppers on a grill rack directly over medium heat; grill, uncovered, for 10 to 12 minutes or until charred, turning frequently. Wrap peppers in foil or place in a clean paper bag; set aside until cool enough to handle (about 10 minutes). Peel peppers; remove and discard stems, seeds, and membranes. Finely chop peppers.
2. Combine the peppers, onion, and soy sauce in a large mixing bowl; add beef and mix well. Shape mixture into 4 patties about 1 inch thick.
3. Place burger patties on the lightly oiled rack of the grill directly over medium heat. Grill for 18 to 23 minutes or until an instant-read thermometer inserted in centers registers 160 degree F, turning burgers once halfway through grilling. Top with cheese slices the last 5 minutes of grilling.
4. Toast buns, if desired. Place burgers on buns. Top with avocado and desired condiments. Makes 4 burgers.