Add the ground beef to a large saute pan and cook until no longer pink, about 6 minutes, stirring occasionally.

Push the beef to the edges and pour the sesame oil in the pan. Then add the onions, garlic, and ginger, and cook for 4 minutes, or until starting to soften.

Stir in the remaining ingredients except for the green onions: ketchup, hoisin, soy sauce, rice wine vinegar, worcestershire, brown sugar, and sriracha.

Simmer the mixture for 10 minutes, stirring occasionally. Serve on buns with green onions and quick pickles, if desired.