Total Time
40 Mins
Yield
Makes 2 sandwiches (serving size: 1 sandwich)
Photo: Thomas J. Story

How to Make It

Step 1

In a medium frying pan over medium heat, heat oil and cook onion, stirring occasionally, until soft and deep golden brown, 10 to 15 minutes. Let cool.

Step 2

Mix cheeses together in a small bowl.

Step 3

Top 2 bread slices with cheese mixture, smushing it evenly onto the bread. Top with caramelized onions and tomato, then other two bread slices.

Step 4

Butter outsides of each sandwich.

Step 5

Heat a large well-seasoned cast-iron skillet or a large, heavy nonstick pan over medium heat for a minute.

Step 6

Place sandwiches in skillet and cook until golden-brown underneath, 5 to 7 minutes. Flip and cook the other side until it's just as toasty. Low and slow is the key. Cheese will probably ooze out, but that's okay. It gives the sandwiches a nice crunchy fringe.

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