Juicy Lucy burgers are native to Minneapolis - they're burgers with a molten core of cheesy goodness. Be careful, because the first bite is messy and potentially super-hot! They are fairly easy to make, as long as you tightly seal the burgers around the cheese. You can see a bit of cheese escaping from the burger above, but that's not a big deal. I like to serve burgers on slider buns - it always seems like there is too much bread in the standard buns. A great accompaniment are these five-star oven fries.
To make the burgers, form eight very thin burgers; put the cheese, folded into fourths, on top of one burger; then top with the other burger. Pinch the edges and form into patties. They should look like this when you start cooking: