Place a large skillet over medium heat and add onion and celery. Cook for 3-4 minutes and then add garlic.
Push vegetables to the side and add ground beef. Cook for 7-8 minutes, or until it is cooked through. Mash to get fine crumbles.
Add the rest of the sauce ingredients. Simmer until the sauce begins to thicken and then slowly add in remaining broth.
Add herbs, salt, pepper, and frozen mixed vegetables and continue simmering until they're heated through.