Salmon Burgers

Flake salmon into large pieces in a medium bowl. Add panko, parsley, mayonnaise, egg, capers, everything bagel seasoning, salt, 3 tablespoons scallions and 1 1/2 teaspoons lemon zest; stir to fully combine. Using your hands, shape the mixture into 4 patties (3 1/2-by-3/4-inch). Cover and refrigerate for 10 minutes.

Heat oil in a large nonstick skillet over medium-high heat. Add the patties; cook until browned on both sides, about 2 minutes per side. Transfer to a plate. 

Combine labneh, the remaining scallions (about 2 tablespoons) and the remaining 1/2 teaspoon lemon zest in a small bowl. Spread 1 tablespoon labneh mixture over 1 side of each bread piece. Place 1 burger on each of 4 bread pieces. Top with tomato and onion. Top with the remaining bread pieces, labneh-side down.