In a food processor, pulse the shrimp until coarsely chopped.

In a mixing bowl, combine the chopped shrimp, bread crumbs, egg, garlic, parsley, Old Bay seasoning, salt, and pepper. Mix until well combined.

Form the mixture into 4 equal patties.

Preheat the grill to medium-high heat.

Grill the shrimp patties for about 4-5 minutes on each side, or until cooked through and golden brown.

Spread mayonnaise on the bottom half of each bun.

Place a lettuce leaf on each bun, followed by a grilled shrimp patty, a slice of tomato, and a drizzle of lemon juice.

Top with the other half of the bun and serve immediately.