Chicken Salad Sandwich - Better Option With Better Fiber

Ingredients

• 1 boneless skinless chicken breast
• Juice of 1/2 lemon
• 3 tablespoons olive oil
• 1/2 teaspoon salt (divided)
• 3 tablespoons organic whole Greek yogurt
• 1 teaspoon lemon zest
• 1 small green apple (cored and roughly chopped)
• 3 tablespoons toasted walnuts (roughly chopped)
• 1-1/2 tablespoons freshly chopped tarragon
• 1 tablespoon fresh chopped parsley
• 2 teaspoons fresh chopped chives
• 3 slices whole grain bread (lightly toasted)
• 3 lettuce leaves