1/3 cup drained roasted red bell peppers, cut into 1/4" strips
4 hamburger buns
2 tbsp. vegetable oil, divided
18 oz. canned salmon, drained, picked through, flaked
1/2 tsp. freshly ground black pepper
1/2 cup plain breadcrumbs
1/4 tsp. kosher salt
2 tsp. fresh lemon juice
2 tsp. drained capers
1/4 cup (packed) coarsely chopped and drained roasted red bell peppers
1 cup mayonnaise