Cut the beef into large cubes, then season generously with salt and pepper. Toss the cubes in flour, ensuring they are lightly coated.
In a large Dutch oven or heavy-bottomed pot, melt the butter over medium-high heat. Brown the beef cubes on all sides until deeply golden brown. Remove the beef from the pot and set aside.
In the same pot, sauté the thinly sliced onions until translucent. Add the minced garlic and cook for another 2 minutes, until fragrant.
Return the browned beef to the pot. Pour in the dark Belgian beer, beef broth, Dijon mustard, and brown sugar. Stir well to combine, scraping up any browned bits from the bottom of the pot.
Add the dried thyme and bay leaves. Bring the mixture to a simmer, then cover and reduce the heat to low. Simmer the stew for 2-3 hours, or until the beef is very tender and easily pulls apart.
Stir the stew occasionally during cooking. If the sauce becomes too thick, add a little more beef broth to reach the desired consistency.
Serve the Carbonnade flamande hot with mashed potatoes, fries, or crusty bread. For an authentic Belgian experience, pair it with a glass of dark Belgian beer.
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