We serve these burgers with rustic rolls, mustard, and lettuce on the side for easy assembly.
Heat 1 tablespoon oil in a medium saute pan over medium heat. Add shallots; cook, stirring, until they are soft and translucent, about 2 minutes. Remove from heat, and set aside.
In a large bowl, mix together turkey, mint, parsley, 2 teaspoons of mustard, and shallots. Season with salt and pepper. Divide into four equal parts, and form into patties.
Heat remaining tablespoon oil in a large saute pan over medium heat. Add patties, and cook until underside is brown, about 3 1/2 minutes. Turn, and continue cooking until other side is brown and center is no longer pink, about 4 minutes. Transfer to plates; serve immediately with rolls, lettuce, mustard, and tomato salad.