Roast beef & cheddar half sub

angus roast beef top round (beef, water, contains 2% or less of: sodium lactate, sodium phosphate, sodium diacetate, salt, hydrolyzed corn protein, flavorings. coated with dextrose, salt, caramel color, onion and garlic powder, hydrolyzed corn protein, spices), white roll (enriched wheat flour [wheat flour, malted barley flour, niacin, reduced iron, thiamine mononitrate, riboflavin, folic acid], water, contains 2% or less of: yeast, sugar, salt, malted barley extract, wheat gluten, vegetable oil [canola oil or soybean oil], fumaric acid, preservatives [calcium propionate, phosphoric acid, sodium propionate], wheat starch, dough conditioners [mono-and diglycerides, ethoxylated mono-and diglycerides, polysorbate 60, ascorbic acid enzymes], lactic acid, sodium diacetate, hydrogenated vegetable oil [soybean, palm and/or cottonseed]), mild cheddar cheese (pasteurized milk, cheese culture, salt, enzymes, annatto [color]), green leaf lettuce.