BISTRO CHEESEBURGER
Yields 4
1-1/2 lb. ground beef
Vegetable oil
4 sweet onion slices (1/2-in. thick)
8 slices Swiss singles cheese
4 crusty rolls, split and toasted
4 romaine lettuce leaves
4 tomato slices (1/4-in. thick)

Sauce:
1/4 cup mayonnaise

1 tbsp. Dijon-style mustard           
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