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Toast Buns and Cook Steak Strips
Pat 10 oz. steak strips dry. Coarsely chop, then separate pieces. Place a large non-stick pan over medium-high heat. Add 2 brioche buns to hot, dry pan. Toast until slightly browned, 1-2 minutes. Transfer buns to a plate. Keep pan over medium-high heat; no need to wipe clean. Add 1 tsp. olive oil, steak strips, 1/4 tsp. salt, and 1/4 tsp. pepper to hot pan. Stir occasionally until no pink remains and steak strips reach a minimum internal temperature of 145°F, 4-6 minutes. Stir in 2/3 of the .88 oz. balsamic vinegar (reserve remaining for sauce) until combined, 30-60 seconds. Evenly top steak strips with 1 oz. shredded Swiss cheese and cover until melted, 2-3 minutes. Remove from burner. Rest, 3 minutes. While buns toast and steak strips cook, continue recipe.