1. Slice the meat into thin strips and season with salt and pepper.

2. Heat a skillet over medium heat and cook the meat until browned and cooked through, about 5-7 minutes. Set aside.

3. Thinly slice the pickling cucumbers into rounds.

4. In the same skillet, add a drizzle of oil and sauté the diced onion until softened, about 3-4 minutes.

5. Preheat the oven to 350°F.

6. To assemble the sandwich, place a layer of Swiss cheese on one slice of bread, then add a layer of sliced pickling cucumbers on top.

7. Add a generous portion of the cooked meat on top of the cucumbers, then add a layer of sautéed onions.

8. Place another layer of Swiss cheese on top of the onions, then top with the second slice of bread.

9. Place the sandwich on a baking sheet and bake for 5-7 minutes, or until the cheese is melted and bubbly.