Another of my husband's childhood favorites, modified slightly to suit my whims. These were so good that the 10-month-old ate a whole patty!
2 tbsp Worcestershire sauce
2 tbsp minced dried onion (or 1 fresh onion)
2 lb ground beef
Spinach to taste (I used 5-6 ounces, or a little more than half of a package; the original recipe calls for a whole package)
Beat together egg, W. sauce, and onion.
Add beef and stir up a little.
Cook spinach in microwave for a few minutes until it gets wilty.
Stir spinach into beef mixture. This should give you enough moisture to make the beef stick together.
Form into patties and cook however you normally cook burgers. I sauteed mine in a skillet with a little butter. Makes about 16 patties, which is maybe 4 servings if you're hungry. ;)