Grilled Gruyere and Sweet Onion Sandwiches

1. 1

   In a deep skillet, melt 1 tablespoon of the butter in the oil.

2. 2

   Add the onion, cover and cook over high heat, stirring once or twice, until softened, about 5 minutes.

3. 3

   Uncover and cook over moderate heat, stirring occasionally, until the onion is very tender and caramelized, about 25 minutes longer.

4. 4

   Add water to the skillet as necessary, 1/4 cup at a time, to prevent the onion from scorching.

5. 5

   Season the caramelized onion with salt and pepper.

6. 6

   Spread the bread with the remaining 2 tablespoons of butter and arrange, buttered side down, on a work surface.

7. 7

   Spread a thin layer of mustard on each slice.

8. 8

   Top half of the slices with the onion, Gruyere and pickles and close the sandwiches.

9. 9

   Preheat a skillet or panini press.

10. 10

    Grill the sandwiches over low heat until the bread is toasted and the cheese is melted, 10 minutes.

11. 11

    If using a skillet, press the sandwiches with a spatula and flip them halfway through.

12. 12

    Cut in half and serve right away.

* Per serving · 4 servings · Values may vary.

No additional tips available.