Combine the first 3 ingredients in a medium bowl; add lamb, tossing to coat.
Heat olive oil in a large nonstick skillet over medium-high heat. Add lamb mixture, and sauté 4 minutes or until browned. Add onions and carrots; sauté for 4 minutes. Stir in broth and wine. Cover, reduce heat, and simmer 7 minutes or until carrots are crisp-tender. Stir in Dijon and tarragon. Increase heat to medium-high; cook, uncovered, 2 minutes or until slightly thickened.