Grilled Salmon With White Bean And Arugula Salad

Ingredients

• 1 tablespoon chopped capers, rinsed and drained
• 1/4 teaspoon grated lemon rind
• 3 tablespoons fresh lemon juice
• 2 tablespoons olive oil
• 3/4 teaspoon kosher salt, divided
• 1/2 teaspoon minced fresh garlic
• 1/8 teaspoon ground red pepper
• 1 (15-ounce) can unsalted Great Northern beans, rinsed and drained
• Cooking spray
• 4 (6-ounce) salmon fillets
• 1/4 teaspoon freshly ground black pepper
• 4 cups loosely packed arugula
• 1/2 cup thinly sliced red onion