Name: Slow Cooker Pastrami Sandwiches with Sauerkraut and Swiss Cheese Recipe
Prep time: 10 min
Cook time: 7 h
Total time: 7 h 10 min
Cuisine: American
Ingredients: 4 lbs. corned beef (flat cut); Spice packet that comes with the corned beef; 1 tsp onion powder; 3 Tbsp brown sugar; ½ tsp ground black pepper; 5 garlic cloves (peeled, left whole); 12 oz beer; 3 cups water; 1 tsp hickory liquid smoke; Marble rye bread; Thousand island dressing; Swiss cheese; Sauerkraut

Jump to Recipe· 4.1 from 7 reviews

If you have ever dreamed of sinking your teeth into a sandwich packed with rich, tender pastrami layered perfectly with tangy sauerkraut and melted Swiss cheese, this Slow Cooker Pastrami Sandwiches with Sauerkraut and Swiss Cheese Recipe is your dream come true. The magic of slow cooking transforms a simple corned beef into a succulent masterpiece, while the combination of flavors and textures makes every bite irresistibly comforting. Whether you’re aiming to impress at a family dinner or just craving a satisfying meal, this recipe delivers a delightful balance of savory goodness and classic deli charm.

Ingredients You’ll Need

Inside a white oval bowl, there are two raw meat pieces stacked one on top of the other, displaying a dark red color. The top layer of the meat is covered with a brown crumbly powder, scattered unevenly, and garnished with five whole peeled garlic cloves and some mixed colorful spices. Around the bowl on a white marbled surface, a glass measuring cup filled with a golden liquid is placed at the bottom left corner, and a glass with a dark liquid is positioned at the top. To the right, a partially peeled garlic bulb and a metal scoop are near the bowl, with a blue and white checkered cloth lying under the bowl's edge. Photo taken with an iphone --ar 4:5 --v 7

These ingredients are straightforward but carry tremendous weight in creating that authentic deli-style sandwich experience. Each component from the spices to the rye bread plays a vital role in building a sandwich that’s bursting with flavor and texture.

4 lbs. corned beef (flat cut): The star of the show, perfectly suited for slow cooking to achieve tender, juicy meat.
Spice packet that comes with the corned beef: Provides that essential classic pastrami seasoning.
1 tsp. onion powder: Adds a mild sweetness and depth of flavor.
3 Tbsp. brown sugar: Balances savory spices with a hint of sweetness for caramelized notes.
½ tsp. ground black pepper: Gives a gentle peppery kick that excites the palate.
5 garlic cloves (peeled, whole): Infuses the meat with subtle, aromatic warmth.
12 oz. beer: Adds moisture and a rich malty undertone to the cooking liquid.
3 cups water: Keeps the corned beef tender over long, slow cooking hours.
1 tsp. hickory liquid smoke: Introduces smoky complexity reminiscent of traditional pastrami.
Marble rye bread: The perfect sturdy base that holds all those flavors together.
Thousand Island dressing: Creamy, tangy, and sweet spread that complements sauerkraut beautifully.
Swiss cheese: Melts beautifully over the warm meat, adding nutty creaminess.
Sauerkraut: Brings a sharp, tangy crunch that cuts through the richness.

How to Make Slow Cooker Pastrami Sandwiches with Sauerkraut and Swiss Cheese Recipe

Step 1: Prepare the Corned Beef

Start by rinsing the corned beef very well under cold water. This step is crucial to remove excess salt that can overwhelm the dish. Pat it dry gently and place it into your slow cooker.

Step 2: Season Generously

Sprinkle the spice packet provided with your corned beef all over the meat, followed by the onion powder, brown sugar, and ground black pepper. Nestle the peeled, whole garlic cloves evenly around the meat to release their aroma during cooking.

Step 3: Add Liquids for Flavor and Tenderness

Pour the beer and water around the beef, then add the hickory liquid smoke. These liquids keep your pastrami moist throughout the long cooking process while infusing it with that deeply satisfying smoky, malty flavor.

Step 4: Slow Cook to Perfection

Set your slow cooker to LOW and let the corned beef work its magic for 7 to 8 hours. This slow, gentle cook ensures the meat becomes meltingly tender and perfectly infused with the spices.

Step 5: Rest and Slice

Once your corned beef has finished cooking, carefully remove it to a cutting board and allow it to rest for 5 to 10 minutes. Resting helps the juices redistribute, making each slice tender and juicy. Then slice thinly to build those sandwiches.

How to Serve Slow Cooker Pastrami Sandwiches with Sauerkraut and Swiss Cheese Recipe

Two sandwiches are on white plates on a white marbled surface. Each sandwich has three layers of swirl rye bread that is brown and light tan in color. Inside each sandwich, the bottom layer consists of melted cheese that is light yellow with a slightly creamy texture. Above the cheese, there is a layer of pinkish-red meat slices that look thick and tender. On top of the meat, there is a layer of pale white shredded cabbage or sauerkraut. The sandwiches are cut in half with one half standing against the other to show the inside layers. A blue and white checkered cloth is near the front plate, and blurred dishes are in the background. Photo taken with an iphone --ar 4:5 --v 7

Garnishes

Elevate your sandwich further by adding crisp pickle slices or a sprinkle of freshly ground black pepper on top. A little extra sauerkraut on the side invites more tangy goodness with every bite, balancing the richness of the meat and melted Swiss cheese beautifully.

Side Dishes

Classic deli-style potato chips or a creamy coleslaw make excellent companions. If you want to go a little heartier, a bowl of homemade matzo ball soup or German potato salad will bring out delightful old-world vibes that perfectly complement these sandwiches.

Creative Ways to Present

For a fun twist, serve your Slow Cooker Pastrami Sandwiches with Sauerkraut and Swiss Cheese Recipe open-faced on toasted rye with broiled Swiss cheese for an irresistibly gooey topping. Or cut into smaller slider portions with wooden skewers for game day or party snacks. The possibilities for presentation are as fun as the flavors!

Make Ahead and Storage

Storing Leftovers

Wrap any leftover sliced pastrami tightly in aluminum foil or place it in an airtight container and refrigerate for up to 4 days. Keeping it properly sealed preserves that rich flavor and juicy texture.

Freezing

If you want to keep your pastrami longer, freezing is a great option. Slice the meat, separate with parchment paper to prevent sticking, and freeze in airtight freezer bags for up to 3 months. Thaw overnight in the refrigerator before reheating.

Reheating

Reheat leftover pastrami gently in a skillet over medium heat or in a covered microwave-safe dish with a splash of water to retain moisture. Avoid overheating to keep the meat tender and prevent dryness.

FAQs

Can I use a different cut of beef for this recipe?

While flat cut corned beef works best to create tender pastrami, you can use point cut if that’s what you have on hand. Just know that the texture will be slightly fattier but still delicious after slow cooking.

Is the beer necessary in the cooking liquid?

The beer adds lovely malty notes that complement the spices and smoke flavors, but if you prefer, you can swap it with beef broth or water for a milder result.

Can I make these sandwiches vegetarian or vegan?

This particular recipe relies on the slow-cooked beef, but you can recreate similar flavors with smoked tempeh or mushroom “pastrami” alternatives combined with vegan Swiss-style cheese and sauerkraut for a plant-based treat.

How long can I leave the corned beef in the slow cooker?

Cooking on LOW for 7 to 8 hours is ideal to develop tenderness without drying out the meat. Going beyond 8 hours might cause the pastrami to become overly soft or crumbly.

What type of mustard works best with these sandwiches?

While Thousand Island dressing is classic, deli mustard or spicy brown mustard can add a nice tangy contrast to the rich pastrami and creamy Swiss cheese if you prefer a bit more zip.

Final Thoughts

There is something so satisfying about crafting a sandwich that tastes like it came from an old-school deli, and the Slow Cooker Pastrami Sandwiches with Sauerkraut and Swiss Cheese Recipe lets you do exactly that with almost zero fuss. The blend of smoky, sweet, tangy, and melty flavors fills your kitchen with irresistible aromas and guarantees smiles all around the table. So go ahead, make this recipe your new favorite comfort food—it’s a total winner every time!

Slow Cooker Pastrami Sandwiches with Sauerkraut and Swiss Cheese Recipe

Ingredients You’ll Need