Salmon Burgers with Tzatziki Sauce - Ellie Krieger

Ingredients

• 1/2 medium English cucumber, trimmed, unpeeled
• 3/4 cups plain Greek yogurt (low-fat or whole)
• 1 tablespoon extra-virgin olive oil
• 1 tablespoon fresh lemon juice
• 1 small clove of garlic, finely minced
• 1 tablespoon chopped fresh parsley leaves
• 1/4 teaspoon salt
• 1/8 teaspoon freshly ground black pepper
• 3 slices whole wheat sandwich bread, crusts removed
• 1 pound skinless salmon fillet
• 2 scallions, (white and light green parts) thinly sliced (¼ cup)
• 3 tablespoons minced celery
• 2 tablespoons fresh chopped dill
• 2 teaspoons Dijon mustard
• 2 teaspoons fresh lemon juice
• 1 large egg white, lightly beaten
• ¼ teaspoon salt
• Burger buns or lettuce leaves, for serving