4 whole-wheat buns
Nonstick cooking spray
Salt and freshly ground pepper, to taste
5 tsp. whole-wheat panko bread crumbs
1 egg, lightly beaten
1 tsp. ground turmeric
2 tsp. ground coriander
2 tsp. ground cumin
2 tsp. chopped fresh cilantro
1 lemongrass stalk, tender inner parts only, finely chopped
1 jalapeno chile, seeds and ribs removed, then finely chopped
2 tsp. finely chopped shallot
1 lb. (500 g) salmon, finely chopped
1/4 tsp. salt
1 tsp. sugar
3 tsp. rice wine vinegar
1/2 small red onion, quartered and thinly sliced
1 cucumber, peeled and cut into 1/4-inch (6-mm) dice