• Equal parts ground round and ground sirloin
• Worcestershire sauce
• Ground onion
• Garlic powder
• Chili powder
• Spicy mustard (optional)

Mix the beef together in a large mixing bowl, and add some Worcestershire sauce. You can be pretty generous with it, and you'll end up with some very juicy burgers. Same with the onion and garlic powder; it takes a lot of each to end up being more than just a subtle flavor in the mix. Be a little more careful with the chili powder, depending on your personal tastes. And I also like to throw in some spicy mustard, but be careful. Make them into patties and throw on the grill!