1. Heat olive oil in a large pot over medium-high heat. Add the beef stew meat and brown properly on all sides without stirring too much — let the color develop.
2. Add the chopped onion and minced garlic and sauté for 2 to 3 minutes, scraping up the browned bits from the bottom of the pot.
3. Stir in the carrots and celery and cook for a few minutes until slightly softened.
4. Add the halved Brussels sprouts, diced tomatoes with their juices, and beef broth. Bring to a simmer.
5. Stir in the Dijon mustard, salt, and pepper until fully incorporated into the broth.
6. Reduce heat to low, cover, and simmer for 1.5 hours until the beef is fork-tender and the Brussels sprouts are completely tender.
7. Taste and adjust seasoning as needed.
8. Ladle into bowls and garnish generously with fresh chopped parsley. Serve hot.

Nutrition Information (Per Serving):

• Calories: 355
• Carbohydrates: 22g
• Protein: 34g
• Fat: 14g
• Fiber: 7g
• Sodium: 740mg
• Vitamin C: 120% DV | Vitamin K: 180% DV | Iron: 22% DV | Potassium: 20% DV

Notes:

• Chuck stew meat is the right choice — lean cuts turn dry and stringy during the long braise.
• Proper browning upfront without constant stirring is the single most important flavor step in this recipe.
• Good quality French-style Dijon makes a noticeably more complex and interesting broth than generic mustard.
• The mustard needs the full 90-minute simmer to mellow properly — don’t taste for mustard sharpness before then.

Storage Tips:

• Refrigerate in an airtight container for up to 3 days — flavor improves each day.
• Freeze for up to 3 months — Brussels sprouts soften further after freezing so consider adding fresh ones when reheating.
• Reheat on the stovetop over low heat with a splash of beef broth to loosen the consistency.
• Add fresh parsley after reheating rather than before storing for the brightest finish.

Serving Suggestions:

• Serve with thick slices of crusty French bread for soaking up every drop of that gorgeous mustard-spiked broth.
• A simple green salad with a light lemon vinaigrette on the side cuts through the richness of the stew beautifully.
• Creamy mashed potatoes underneath the stew instead of alongside it makes this an incredibly hearty and complete one-bowl meal.
• A final crack of black pepper and extra fresh parsley right before eating makes each bowl look genuinely restaurant-worthy.

Mix It Up:

• Double Mustard Beef Stew: Add a teaspoon of whole grain mustard alongside the Dijon for occasional mustard seed bursts and extra texture throughout.
• Hearty Holiday Beef and Brussels Stew: Add diced potatoes with the carrots and celery for an even more substantial cold-weather version.
• Smoky Beef and Mustard Sprout Stew: Add a teaspoon of smoked paprika with the vegetables for a smoky depth that weaves beautifully through the mustard flavor.
• Weeknight Mustard Beef Bowl: Use thinly sliced sirloin and reduce simmer time to 30 minutes for a faster version that delivers the core flavors on a busy evening.

What Makes This Recipe Special: This beef and mustard sprout stew draws from centuries of French and Belgian braising tradition where Dijon mustard has been used as a slow-cooking ingredient rather than a condiment — transforming during extended low heat from something sharp and pungent into a rounded, savory flavor amplifier that makes every other ingredient in the pot taste more defined and interesting. The technique of adding the mustard at the beginning of the simmer rather than at the end is the key detail that separates a truly integrated, complex broth from a merely seasoned one. Combined with properly caramelized chuck beef, hearty Brussels sprouts, and a full 90 minutes of patient simmering, this is a stew that delivers genuinely extraordinary results from a completely approachable process.