Turkey Burger With Lemon Mayonnaise

• 3 tablespoons canola oil
• 1 onion, halved and thinly sliced
• 1/2 cup finely chopped celery
• 1/2 cup finely chopped granny smith apple
• 2 scallions, thinly sliced
• 1 small canned chipotle pepper, in adobo sauce, minced
• 1 1/2 lbs lean ground turkey breast
• 1 tablespoon minced flat-leaf parsley
• 2 teaspoons finely grated lemon zest
• kosher salt and freshly ground black pepper
• 1/3 cup reduced-fat mayonnaise
• 1 1/2 teaspoons fresh lemon juice
• 1/4 teaspoon chopped thyme
• 5 whole wheat hamburger buns, split and toasted
• 5 iceberg lettuce leaves
• 5 tomatoes, slices

1. In a nonstick skillet, heat 1 tablespoon of the canola oil. Add the sliced onion and cook over moderate heat, stirring occasionally, until golden and softened, about 25 minutes. Transfer the onion to a bowl. Wipe out the skillet.
2. Heat 1 tablespoon of the canola oil in the skillet. Add the celery, apple and scallions and cook over moderate heat until softened, about 8 minutes. Transfer to a bowl and add the chipotle; let cool. Stir in the turkey, parsley, 1 teaspoon of the lemon zest, 2 teaspoons of salt and 1/4 teaspoon of pepper. Shape the mixture into four 1/2-inch-thick patties.
3. In the skillet, heat the remaining 1 tablespoon of canola oil. Add the burgers and cook over moderately high heat, turning once, until no longer pink inside, 10 minutes.
4. Meanwhile, in a small bowl, mix the mayonnaise with the remaining 1 teaspoon of lemon zest, the lemon juice and chopped thyme and season with salt and pepper. Spread the lemon mayonnaise on the top halves of the buns; set the burgers on the bottom halves and top with the caramelized onions, lettuce and tomato. Close the burgers and serve.

canola oil, onion, celery, granny smith apple, scallions, pepper, lean ground turkey breast, flatleaf parsley, lemon zest, kosher salt, mayonnaise, lemon juice, thyme, whole wheat hamburger buns, tomatoes

Taken from www.food.com/recipe/turkey-burger-with-lemon-mayonnaise-438140 (may not work)