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1
Combine Thousand Island Dressing and ketchup thoroughly, set aside.
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2
Form ground beef into 8 thin patties.
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3
Pan fry to desired doneness, set patties aside.
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4
While patties are cooking, lightly toast all 8 slices of bread in a toaster.
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5
Drain the excess fat from the skillet, add 1/2 tablespoon butter or margarine to the skillet (medium heat) and add all the onions when butter has melted.
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6
Cook onions 2-3 minutes or until softened, remove and set aside- do not drain skillet.
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7
Place 4 slices of bread in the skillet (or as many as you can at once; repeat the following steps in smaller increments if necessary).
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8
Cook 1-2 minutes, or the bread is until lightly toasted. Flip bread and toast other side.
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9
Remove from the skillet, melt the remaining butter and repeat the toasting with the remaining slices of bread.
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10
Top bottom slices of bread with one slice of American cheese.
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11
Layer one beef patty on top of cheese, then a slice of Swiss cheese, another beef patty, another slice of American cheese.
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12
Distribute grilled onions evenly on all four sandwiches.
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13
Spread top slices of bread with the dressing mixture, and close sandwiches.
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14
Cut each sandwich in half diagonally, and serve with 2 lettuce leaves and 2 tomato slices.
