Tarragon Chicken Burgers with Lemon Caper Mayonnaise

Ingredients

• 1 lb ground chicken
• 1/2 cup finely chopped green onion
• 1/3 cup finely chopped celery
• 2 tsp minced garlic
• 1/4 cup panko breadcrumbs
• 2 tbsp olive oil
• 2 tbsp chopped fresh tarragon
• 1 tsp grated lemon peel
• 1 tsp salt
• 3/4 tsp freshly ground pepper
• lettuce and sweet onion slices for serving
• 1 cup store bought mayonnaise
• 1/4 cup coarsely chopped rinsed drained capers
• 2 tbsp lemon zest and lemon juice