Follow these simple instructions to whip up your Korean Beef Sloppy Joes:

1. Prepare the Ingredients: Ensure all ingredients are measured and ready to go.
2. Cook the Beef: In a large skillet, heat vegetable oil over medium heat. Add the ground beef and cook until browned, breaking it apart with a spatula, about 5-7 minutes.
3. Add Aromatics: Once the beef is browned, drain excess fat. Add the chopped onion and minced garlic to the skillet, cooking until soft and fragrant, about 2-3 minutes.
4. Combine Sauces: Stir in the soy sauce, brown sugar, sesame oil, and crushed red pepper flakes (if using). Mix well until the ingredients are combined.
5. Simmer: Allow the mixture to simmer on low heat for 5-7 minutes, stirring occasionally, until the sauce thickens slightly.
6. Add Green Onions: Turn off the heat and stir in the sliced green onions for a fresh touch.
7. Toast Buns: While the beef is simmering, lightly toast the hamburger buns on another skillet or in the oven until golden.
8. Assemble the Sloppy Joes: Spoon the Korean beef mixture onto the bottom half of each toasted bun.
9. Garnish: Sprinkle sesame seeds on top for added flavor and texture.
10. Serve: Cap with the top half of the buns and serve immediately.

By following these steps, you’ll create Korean Beef Sloppy Joes that are not only delicious but also visually appealing. The vibrant colors and hearty ingredients will tantalize your senses before you even take a bite.