Preheat your oven to 350°F (175°C) and line a large baking sheet with parchment paper.

Cook ground beef and diced onion in a skillet over medium heat until browned, about 8-10 minutes. Season and drain excess fat.

Roll out the refrigerated French bread dough on a floured surface to a rectangular shape of about 12x18 inches.

Spread ketchup and mustard over the dough, leaving a ½-inch border around the edges.

Layer cooked ground beef mixture, bacon, chopped pickles, and cheese slices evenly over the condiments.

Roll the dough tightly from one long side, sealing the edges and pinching the seam.

Place the rolled bread seam-side down on the baking sheet. Brush with a beaten egg and sprinkle with sesame seeds.

Bake for 20-25 minutes until golden brown and puffy. Monitor closely for desired doneness.

Cool for 5 minutes before slicing. Serve warm with Thousand Island dressing for dipping.