In a small bowl combine cucumber, vinegar and sugar. Cover and refrigerate 15 minutes.
Place salmon in a food processor; pulse 5 to 7 times or until finely chopped. Transfer to a large bowl. Add panko, sweet potatoes, ginger, egg white and soy sauce; stir to combine. Shape into 4 patties, 1/2-inch thick.
Coat a large grill pan or skillet with nonstick cooking spray; place over medium-high heat. Add patties to skillet; cook 4 to 5 minutes per side or to desired doneness. Place 1 burger on each bun, top with pickles, and serve.
Serving Size 1 burger
Servings 0
* Percent Daily Values are based on a 2,000 calorie diet. Your daily value may be higher or lower depending on your calorie needs.