Steak Hamburger Hawaii

Bahan-bahan (4 porsi)

• 1 ½ pounds lean ground beef
• ¼ cup Italian bread crumbs
• 1 tablespoon fresh rosemary, (minced)
• 2 teaspoons Worcestershire sauce, (divided)
• 1 medium onion, (thinly sliced or chopped)
• 2 tablespoons olive oil
• 1 tablespoon unsalted butter
• 2 cups beef broth
• 1 tablespoon ketchup
• 1 tablespoon cornstarch
• salt and pepper to taste