Sear the Beef: Begin by heating the olive oil in a large skillet over medium-high heat. While the oil heats, generously season the beef chuck roast with salt and black pepper. Carefully place the roast in the skillet and sear it on all sides until deeply browned, which should take about 4-5 minutes per side. Once seared, remove the beef from the skillet and set it aside on a plate.
Sauté Onions and Garlic: In the same skillet, without cleaning it, add the thinly sliced onions and minced garlic. Sauté for approximately 5 minutes, stirring frequently, until the onions become soft and translucent. This step enhances the flavor base for your dip.
Prepare the Slow Cooker: Transfer the sautéed mixture of onions and garlic to the bottom of your slow cooker. Place the seared beef roast directly on top of the onion-garlic mixture for maximum flavor infusion.
Add Remaining Ingredients: Carefully pour the beef broth over the roast, ensuring it covers the meat well. Add the Worcestershire sauce, dried thyme, and an extra pinch of salt and pepper to taste. Adjust the seasoning if necessary, ensuring the roast is submerged in the savory liquid.
Cook: Seal the slow cooker lid and set it to cook on low for 8 hours or high for 4-5 hours. The beef is cooked when it is fork-tender and shreds easily.
Shred the Beef: After cooking, remove the beef from the slow cooker and place it on a cutting board. Using two forks, shred the beef into bite-sized pieces. Return the shredded beef to the slow cooker and stir it back into the flavorful cooking liquid to soak up all those delicious juices.
Toast the Rolls: Preheat your oven to 350°F (175°C). Slice the French rolls in half lengthwise and arrange them cut-side up on a baking sheet. Toast the rolls in the preheated oven for about 5 minutes, or until they are lightly golden and crispy.
Assemble the Sandwiches: For each toasted roll, layer a generous portion of the shredded beef on the bottom half. Place a slice of provolone cheese directly on top of the beef. Cap it with the top half of the roll to create a hearty sandwich.
Melt the Cheese: (Optional) Return the assembled sandwiches to the oven for an additional 3-5 minutes, allowing the cheese to melt and become beautifully bubbly for an extra layer of flavor.
Serve: Ladle some of the rich cooking liquid (au jus) into small bowls for dipping each sandwich. For an added pop of color, garnish the sandwiches with freshly chopped parsley before serving.
Notes
For extra flavor, serve with freshly chopped parsley as a garnish.