Chicken burgers flavored with garlic and lemon stay moist and juicy from the addition of a little mayonnaise, panko crumbs and an egg. Top with a slice of fried tomato and a spoonful of blue cheese spread.
Place the chicken, garlic, panko crumbs, egg, lemon zest, lemon juice, mayonnaise, 1/2 teaspoon salt, black pepper and cayenne in a large bowl. Combine thoroughly and form into four 4-inch diameter patties. Transfer to a plate and refrigerate for 1 hour.
While the burgers chill, make the blue cheese spread. Combine the blue cheese, mayonnaise, sour cream, lemon juice, garlic and black pepper in a small bowl. Set aside until ready to serve.
Preheat a gas or charcoal grill to medium heat. Oil the grates and brush the chicken burgers lightly with oil as well. Place the burgers on the grill and cook until lightly browned and cooked through, 4 to 4-1/2 minutes per side. Transfer to a plate, cover loosely with foil and allow to rest while you fry the tomatoes.
Season both sides of the tomato slices with salt and pepper and coat lightly with flour. Heat 1 tablespoon of olive oil over medium-high heat. Add the butter and swirl to combine. Add the tomatoes and fry until they form a golden crust, about 1-1/2 minutes per side.
To serve, place one burger on each bun, top with a fried tomato slice and a dollop of blue cheese spread.