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Place carrots, onion and garlic into food processor bowl. Pulse until finely chopped, stopping to scrape down sides of bowl as needed.
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Add panko, walnuts, cilantro, cornstarch, flax seeds, lime juice, cumin and salt. Blend until completely mixed, stopping to scrape down sides of bowl as needed. Add a splash of water if the mixture seems a little dry.
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Shape mixture into 3-4 patties.
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Coat a large skillet with olive oil and place over medium heat.
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Working in batches if necessary, place burgers in skillet and cover. Cook about 4 minutes, until lightly browned on bottoms. Gently flip, recover, and cook another 4 minutes on opposite side.