Before You Begin
Prepare your cookware as needed. Cooking times and results may vary depending on your equipment and ingredients.
Preheat oven to 325°F (163°C).
Pat short ribs dry and season all sides with salt and black pepper.
Heat olive oil in a Dutch oven over medium-high heat. Sear ribs on all sides until deeply browned. Transfer to a plate.
Add onion, carrots, and celery to the pot. Cook until softened. Stir in garlic and tomato paste until fragrant.
Pour in apple cider, scraping the bottom of the pot to release browned bits. Simmer briefly.
Add beef broth, Dijon mustard (if using), herbs, and cinnamon stick. Stir gently.
Return ribs to the pot. Liquid should cover most, but not all, of the meat.
Cover and braise in the oven for 2½–3 hours, until meat is fork-tender.
Remove ribs. Skim excess fat and simmer sauce uncovered until slightly thickened.
Serve warm with sauce spooned over the ribs.