Directions

1. Season chicken with salt and pepper; coat with flour, shaking off excess.
2. In a Dutch oven or 5-quart pot with a tight-fitting lid, heat oil over medium-high. Cook chicken until browned, 3 to 4 minutes per side. Remove; set aside.
3. Add shallots and garlic; cook, stirring occasionally, until slightly softened and golden brown, about 5 minutes. Add wine; cook until evaporated, 3 to 5 minutes. Stir in mustard and 1 1/2 cups water; bring to a boil.
4. Return chicken, bone side down, to pot. Reduce heat to a simmer, cover, and cook until chicken is tender and cooked through, 30 to 35 minutes. Transfer chicken to a plate; loosely tent with aluminum foil to keep warm. Add tomatoes to pot; season with salt and pepper. Cook on high until sauce has thickened, 6 to 8 minutes. Return chicken to pot; reheat if necessary. Garnish with tarragon, if desired, and serve.