Toasted Gruyere, Golden Onion, and Apple Sandwiches

1. 1

   In a 10-inch heavy skillet heat oil over moderate heat until hot but not smoking and cook onions with rosemary, stirring occasionally, until golden, about 10 minutes.

2. 2

   Stir in vinegar and salt and pepper to taste and cook until vinegar evaporates.

3. 3

   Cool onion mixture.

4. 4

   Preheat broiler.

5. 5

   On a baking sheet toast both sides of bread about 3 inches from heat until golden.

6. 6

   Core apple with a melon-ball cutter and cut crosswise into very thin slices.

7. 7

   Divide onion mixture among toasts, spreading evenly, and cover with overlapping apple slices.

8. 8

   Cover apple slices with Gruyere and broil sandwiches until cheese is melted and bubbling, about 1 minute.

* Per serving · 4 servings · Values may vary.