Mix sirloin, pepper, egg white, 1/2 teaspoon of the salt and hot sauce in a bowl. Form into four 4-inch patties. Set aside. Cook corn with 1 tablespoon water in microwave 30 seconds; mix with tomato, cilantro, juice and remaining 1/2 teaspoon salt in another bowl. Grill burgers 12 minutes, turning halfway through, until no longer pink in the center.