Frisco Melts

I've been trying to find out how Steak 'n Shake
gets their thousand island dressing to taste so
much different (and so much better) from the
store-bought variety for ages. It's so simple.

Ingredients:
2 tablespoons thousand island dressing
1 tablespoon ketchup
1 lb ground beef 85/15
8 slices sourdough bread
1 tablespoon butter
2 tablespoons onions, diced fine
8 slices American cheese
4 slices swiss cheese
tomato
lettuce

Directions:
In a bowl, combine dressing and ketchup, set aside.
Form ground beef into 8 thin patties.
Pan fry to desired doneness, set patties aside.
While patties are cooking, lightly toast
all 8 slices of bread in a toaster.
Drain the excess fat from the skillet,
melt 1/2 tablespoon butter to the skillet
(medium heat) and add all the onions.
Cook onions 2-3 minutes or until softened,
remove and set aside, do not drain skillet.
Place 4 slices of bread in the skillet.
Cook 1-2 minutes, or the bread
is until lightly toasted.
Flip bread and toast other side.
9Remove from the skillet, melt the
remaining butter and repeat the toasting
with the remaining slices of bread.
Top bottom slices of bread with
one slice of American cheese.
Layer one beef patty on top of cheese,
then a slice of Swiss cheese,
another beef patty, another slice of American cheese.
Distribute grilled onions evenly on all four sandwiches.
Spread top slices of bread with the dressing mixture.
Place top slice over sandwiches.
Cut each sandwich in half diagonally,
and serve with 2 lettuce leaves and 2 tomato slices.