Preheat a grill to medium heat. In a large bowl, combine ground chicken, chopped red onion, chopped cilantro, chopped parsley, tomato paste, chopped jalapeños, grated garlic. Season with oil, cumin, Aleppo pepper, kosher salt, sumac, and fresh lemon zest. Mix thoroughly.
When the grill is hot, lightly coat it with grill spray. Place the chicken burgers over direct heat, then cook until the chicken reaches an internal temperature of 165°F. Place slices on top of burger patties. Transfer to a large plate, then allow to rest.
While the burgers are resting, quickly make the garlic mayo by combining mayonnaise, garlic, fresh lemon juice, chopped parsley, and kosher salt. Mix well, then taste and adjust seasoning as needed.
Spoon a little garlic mayo on each side of the bun. Place a chicken burger on top, then add any toppings you like. I love sliced tomatoes and pickled red onion. Place the top bun on top, then enjoy immediately!