Ingredients:
- Burgers:
- 2 slices high-quality whole-wheat bread
- 2 pounds raw large shrimp, peeled, deveined, and divided
- 1 egg white
- 1 tablespoon grated onion
- 3/4 tablespoon Old Bay seasoning
- 1/4 teaspoon freshly ground black pepper
- 1/4 cup chopped parsley
- Sauce:
- 1/4 cup light mayonnaise
- 1/4 cup light sour cream
- 1 1/2 teaspoons lemon zest
- 1 tablespoon lemon juice
- 2 teaspoons capers, chopped (optional)
- 1 teaspoon prepared horseradish
- 1 teaspoon chopped parsley
- Remaining Ingredients:
- 3 teaspoons canola oil, divided
- 6 hamburger buns, toasted
- 6 romaine lettuce leaves
- 6 (1/4-inch-thick) slices tomato