If you've recently enjoyed a delicious corned beef dish and find yourself with some leftovers, you're in luck! You can transform those tasty remnants into a mouthwatering Reuben sandwich. This classic deli sandwich is not only a crowd-pleaser but also a fantastic way to reduce food waste. Let's dive into a step-by-step guide to create the perfect Reuben sandwich using your leftover corned beef.
Ingredients and Equipment
Before you start, ensure you have the following ingredients and equipment ready:
- Leftover corned beef, thinly sliced
- 2 slices of rye bread
- 1/2 cup sauerkraut, drained
- 2 slices Swiss cheese
- 2 tbsp Russian dressing or thousand island dressing
- 1 tbsp butter, room temperature
- 1 tbsp Thousand Island dressing (optional, for topping)
Equipment
- Non-stick skillet
- Spatula
- Plate
Preparation
The key to a perfect Reuben is to assemble it carefully and cook it slowly to allow the flavors to meld together. Here's how to prepare your Reuben sandwich with leftover corned beef:

Step 1: Toast the Rye Bread
Start by toasting your rye bread slices to your desired level of crispiness. This adds a delightful crunch to your sandwich and helps prevent the bread from becoming soggy.
Step 2: Assemble the Sandwich
Once your bread is toasted, it's time to build your Reuben. Spread a thin layer of Russian dressing on one side of each slice of toast. On the dressing side of one slice, layer the following in this order:
- 1 slice of Swiss cheese
- Your leftover corned beef (around 3-4 oz)
- Drained sauerkraut
- The second slice of Swiss cheese
Top with the second slice of toast, dressing side down.

Step 3: Cook the Reuben
Heat your non-stick skillet over medium heat. Butter both sides of your assembled sandwich. Once the skillet is hot, carefully place the sandwich in the skillet. Cook for 3-4 minutes on each side, or until the bread is golden brown and the cheese has melted and started to ooze out the sides.
Step 4: Serve and Enjoy
Transfer your Reuben to a plate, and if desired, drizzle a small amount of Thousand Island dressing on top. Slice your Reuben in half, and serve immediately. Enjoy your delicious, homemade Reuben sandwich made with leftover corned beef!
Tips for the Perfect Reuben
To elevate your Reuben game, consider these tips:

- Use high-quality ingredients: Opt for fresh, high-quality rye bread, Swiss cheese, and corned beef for the best flavor.
- Drain the sauerkraut: Draining the sauerkraut helps prevent your sandwich from becoming too soggy.
- Cook low and slow: Cooking your Reuben at a medium heat allows the cheese to melt and the flavors to combine without burning the bread.
- Customize your Reuben: Feel free to add or substitute ingredients based on your preferences. Some popular additions include Thousand Island dressing, Thousand Island dressing, or even a fried egg.
With this comprehensive guide, you're well on your way to creating the ultimate Reuben sandwich using your leftover corned beef. Happy cooking!






















