Prep gravy: In a medium bowl, add the beef stock, cornstarch, soy sauce, ketchup, sugar, Worcestershire sauce, and salt. Mix to combine and set aside. See Note 3.
2 cups beef stock, 2 Tablespoons cornstarch, 2 Tablespoons soy sauce, 1 Tablespoon ketchup, 2 teaspoons sugar, 1 ½ teaspoons Worcestershire sauce, ½ teaspoon sea salt
Mix burger patties: Mix together the ground beef, diced onions, panko bread crumbs, milk, garlic, salt, and black pepper. Divide and form into four patties. Lightly apply oil to hands for easier forming.
1 lb ground beef, ⅓ cup onion, ¼ cup panko bread crumbs, 3 Tablespoons milk, 2 cloves garlic, ¾ teaspoon sea salt, ¼ teaspoon black pepper
Fry burgers: In a lightly greased nonstick pan, cook burgers over medium high heat until fully cooked, about 3 to 4 minutes per side. Remove burgers and reduce heat to medium low.
Gravy: Stir the gravy mixture as the cornstarch can settle then add it to the pan. Keep stirring until it comes to a boil and thickens, about 1 to 2 minutes. See Note 4.
Fry eggs: Fry eggs to your liking - sunny side up, over medium, or over easy.
Assemble: Add steamed rice to a bowl, top with a burger patty, pour a generous amount of gravy on top, then top with a fried egg. Garnish with green onions and serve.