1. Chop the shrimp into small pieces and place in a mixing bowl.
2. Add the beaten egg, panko breadcrumbs, mayonnaise, soy sauce, sriracha, salt, and black pepper. Mix well.
3. Form the mixture into 4 patties.
4. Heat a frying pan over medium heat and add a little oil. Cook the patties for about 4-5 minutes on each side, until golden brown and cooked through.
5. Assemble the burgers by placing a lettuce leaf and a slice of tomato on each toasted bun. Add the shrimp patty and top with the other half of the bun.