Roast beef sandwich with blue cheese mayonnaise

Bread (enriched bleached wheat flour (flour, malted barley flour, niacin, reduced iron, thiamin mononitrate, riboflavin, folic acid), water, yeast, contains 2% or less of: salt, soybean oil, high fructose corn syrup, acetic acid, vinegar, monoglycerides, calcium sulfate, ammonium sulfate, xanthan gum, soy lecithin, calcium propionate (preservative)), roast beef (beef, water, salt, sodium phosphates, sugar, flavoring, rubbed with salt, dextrose, sugar, caramel color, garlic powder, onion powder, spices), mayonnaise (soybean oil, water, whole eggs and egg yolks, vinegar, salt, sugar, lemon juice, calcium disodium edta (preservative), natural flavors) blue cheese (milk, cheese cultures, salt, enzymes, powdered cellulose (anticaking), natamycin (preservative)) arugula, onion.