01 - 
                Heat oil in a large skillet over medium-high heat. Add ground beef and cook until browned, about 3-5 minutes. Drain excess fat.
              
              
              
                02 - 
                Stir in diced onion and bell pepper. Cook until tender, about 3-4 minutes.
              
              
              
                03 - 
                Add tomato paste, minced garlic, smoked paprika, chili powder, and cayenne pepper. Stir until fragrant, about 1 minute.
              
              
              
                04 - 
                Pour in beef stock, scraping the skillet’s bottom to deglaze. Stir in ketchup, Dijon mustard, Worcestershire sauce, and brown sugar.
              
              
              
                05 - 
                Reduce heat to low and simmer, stirring occasionally, until the mixture thickens and flavors blend, about 15-20 minutes.
              
              
              
                06 - 
                Pile the saucy beef mixture onto toasted buns and serve immediately.