The story
El Mesón Sándwiches was founded by Felipe Pérez Valentín in 1972, with its first restaurant in the beach town of Aguadilla, Puerto Rico. The original restaurant was known primarily for its home-style sandwiches in a family-style atmosphere. Many of its early customers were mainland American surfers who came early in the day asking for big, healthy breakfasts. Their requests prompted Pérez Valentín to create a sandwich stuffed with fresh vegetables and soy-based protein, dubbed "The Surfer". In 1987, El Mesón's second location opened and rapid growth followed shortly after Pérez Valentín's son returned from college.
From Wikipedia’s article on El Mesón Sándwiches, shared under CC BY-SA 4.0.4