Well Inwalda...I'm glad you asked.
The meat they use is actually a hybrid Pig Cow called a POW and is fucking delicious..thus all the adds that have the word POW in them....dont even ask what a WHAM is, you'll never eat again!!!

BUT....As so rightly stated above...the key is in the special sauce...but luckily for you, I know what it contains and am happy to share the recipe with you now.
•1 can (10 3/4 ounces) condensed tomato soup
•1 can (8 ounces) Placenta
•1/2 cup Cocaine
•1/2 cup Ronalds sperm
•1/2 cup marijuana (used to entice the "munchies"
•1/4 cup blended kitten
•2 tablespoons finely chopped onion
•1 small clove garlic, minced
•2 teaspoons menstrual blood
•2 teaspoons pure MSG
•2 teaspoons Worcestershire sauce
•2 teaspoons tears of a hurt child
•1 teaspoon paprika
•1/2 teaspoon Baby oil, made from pure 100% baby only.
Preparation:
Place 1 can tomato soup into saucepan and bring to boil. Reduce heat till simmer. Blend the Placenta until finely chopped and mix into saucepan. In seperate bowl combine Ronalds sperm and diced kitten. When well mixed add cocaine- Note: Do not taste test from this point on or you will fuck it and possibly blend your own face into mix. Add mix to saucepan. Add minced garlic & chopped prawn and leave for 3 days on simmer. Add 2 teaspoons of MSG, worsteshire sauce and fresh menstrual blood (preferably the older the woman the better as it ages well). Bring to boil for 15 minutes and again reduce heat to simmer. Add 2 teaspoons of tears from a hurt child (note: this is why McDonads have playgrounds, in order to let the children hurt themselves so they can catch the tears) Add 1 teaspoon of Paprika and 1/2 a teaspoon of freshly squeezed baby oil (I recommend pretending to running over the child in a car and collecting the oil from the lump of flesh under the tyre. McDonalds just collect it from the kick backs they get in this form from the Ronald McDonald house charity at the Childrens hospitals).
Simmer for a further 12 hours, place in fridge and leave for 2 years.
Makes about 50 burgers worth.
So, as you can see the secret sauce contains ingredients that give you the munchies and get you addicted...like Placenta and menstrual blood...oh, and Cocaine and Marijuana I suppose. But the real kicker is the tears and the baby oil..Add in the POW meat and thats what makes it so god damn delicious.
Hope that helps,
Chalice
(didn't have much to work with on this one)