Salmon Burgers with Dill Mustard

1 ½ lbs. Skinless salmon filet cut into chunks (I use canned salmon)
2 Tbsp capers chopped
Grated peel of ½ lemon
1/3 cup finely chopped flat leaf parsley
2 tsp seafood seasoning (or just seasoning salt)
salt and pepper
1 Tbsp olive oil
¼ seedless cucumber, chopped or sliced thin
2 plum tomatoes chopped or sliced thin
½ small red onion, chopped or sliced thin
½ cup Dijon or Honey Mustard
3 Tablespoons fresh dill chopped
4 kaiser rolls
4 red-leaf lettuce leaves

Using a food processor, coarsely chop the salmon, transfer to a bowl. Mix in the capers, lemon peel, parsley and seafood seasoning and season with salt and pepper. Form into 4 patties
Preheat the broiler. In a nonstick skillet, heat the olive oil over medium high heat. Add the patties and cook for 4 minutes on each side.
Meanwhile, in a small bowl, combine the cucumber, tomatoes and red onion (if chopped). In another small bowl, mix the mustard with the dill.
Toast the rolls under the broiler and slather each side with the mustard-dill sauce. Squeeze the lemon half over the cooked burgers. Set a lettuce leaf and burger on each roll bottom and top with the tomatoes, cucumbers and onions.