Pre-heat your oven to 300F and get your dutch oven ready

Head your oil over high heat and brown your season chuck roast on all sides until a nice crust has developed - 3-5 minutes per side.

Remove beef, add diced onion to pan and cook until softened, 5-7 minutes.

Add balsamic, and reduce until it's a syrupy glaze and add dijon.

Toss in thyme, and return beef to pan. Roast for 2 hours covered.

Add carrots and potatoes and return to oven for another hour until everything is a tender mess. Serve family style.