Cook the Beef: Heat butter and olive oil in a large skillet over medium to medium-high heat. Add ground beef and cook, breaking it apart until browned (about 5 minutes). Drain excess fat.
Sauté the Veggies: In the same skillet, add minced onion and green bell pepper. Cook for 2–3 minutes until softened. Stir in garlic and cook another 30 seconds until fragrant. Return the beef to the skillet and mix in tomato paste.
Build the Flavor: Add ketchup, water, brown sugar, mustard, chili powder, Worcestershire sauce, salt, black pepper, red pepper flakes, and hot sauce (if using). Stir until well combined.
Simmer: Reduce heat to medium-low and cook for 10–15 minutes, stirring occasionally, until the mixture thickens to your desired consistency.
Serve: Spoon the mixture onto toasted buns and enjoy the messy, flavorful goodness!
Serving and Storage Tips
