Reuben Soup Recipe
This creamy Reuben Soup transforms the classic deli sandwich into a rich, velvety bowl featuring tender corned beef, tangy sauerkraut, and melted Swiss cheese.
- Starch-stabilized roux prevents the Swiss cheese from breaking or turning greasy.
- Rinsing the sauerkraut controls the pH level to prevent curdling the dairy.
- Caraway seeds mimic the classic rye bread flavor profile directly within the broth.
The secret to a perfect Reuben soup is emulsion.
Standard cheese soups often break, leaving a greasy film on top of a grainy liquid. To prevent this, we build a stable starch-and-fat network using a classic flour-and-butter roux before adding any liquid.
This network coats the proteins in the Swiss cheese, preventing them from fusing together into rubbery clumps.
Acidity is another critical variable in this formula. While sauerkraut provides the signature tang of a classic Kimchi Reuben Sandwich or a hearty Kielbasa Sauerkraut Soup, excess lactic acid will curdle the dairy. Rinsing the sauerkraut under cold water and squeezing it dry removes excess brine, allowing you to control the pH of the soup base.
We use beef stock and whole milk for richness.
If you enjoy a traditional Corned Beef and Cabbage Soup, you will appreciate how this version concentrates those savory flavors. The addition of caraway seeds mimics rye bread, while a drizzle of Russian dressing adds a sweet, creamy finish.
Reuben Soup
Ingredients
- 4 tbsp unsalted butter
- 1 small yellow onion, finely diced
- 1 celery rib, finely diced
- 1/4 cup King Arthur all-purpose flour
- 2 cups low-sodium beef broth
- 1 1/2 cups whole milk
- 1/2 tsp caraway seeds, lightly crushed
- 1 cup sauerkraut, rinsed, drained, and squeezed dry
- 8 oz cooked corned beef, chopped or shredded
- 1 1/2 cups Swiss cheese, freshly shredded
- Salt and freshly cracked black pepper to taste
- Rye bread croutons, for serving
- Thousand Island or Russian dressing, for drizzling
Directions
- Melt the butter in a large Dutch oven over medium heat. Add the onion and celery, cooking for 5 to 6 minutes until the vegetables are soft and translucent.
- Sprinkle the flour over the vegetables. Stir constantly for 2 minutes to cook out the raw flour taste and form a smooth roux.
- Slowly whisk in the beef broth and whole milk, ensuring no lumps form. Bring the mixture to a gentle simmer, stirring frequently as the starch gelatinizes and thickens the liquid.
- Stir in the caraway seeds, rinsed sauerkraut, and chopped corned beef. Reduce the heat to low and simmer gently for 10 minutes to allow the flavors to meld.
- Remove the pot from the heat source entirely. Add the shredded Swiss cheese one handful at a time, whisking constantly until completely melted and emulsified into the soup.
- Season with salt and black pepper to taste. Ladle into bowls and top with rye croutons and a drizzle of Russian dressing.
Notes
Follow these technical rules to ensure a perfectly emulsified soup.
- Use King Arthur all-purpose flour for the roux; if using a lower-protein brand like White Lily, increase the flour by 1 tablespoon to ensure proper thickening power.
- Shred your own Swiss cheese from a block rather than buying pre-shredded bags; pre-shredded cheese is coated in potato starch or cellulose, which prevents melting and results in a gritty texture.
- If you add the cheese while the soup is actively boiling, the proteins will denature and tighten, squeezing out fat and curdling the soup. Prevent this by removing the pot from the heat completely before stirring in the cheese.
- After 24 hours in the refrigerator, the starch network will undergo retrogradation, causing the soup to thicken significantly. It will require a splash of beef broth to restore its original consistency upon reheating.
- If you do not have a heavy-bottomed Dutch oven, use a thick stainless steel saucepan, but reduce the heat slightly to prevent the milk solids from scorching on the thinner bottom.
Serving Suggestions
Complete this rich soup by pairing it with elements that offer sharp acidity and crisp textures to balance the heavy dairy and savory beef.
- Top with homemade Grilled Cheese Croutons made with rye bread and extra Swiss cheese for a decadent crunch.
- Serve alongside a crisp green salad tossed in a light vinaigrette to cut through the soup's richness.
- Pair with a cold, malty Irish red ale or a dry pilsner to cleanse the palate between spoonfuls.
- Offer extra dill pickle spears on the side for a bright, vinegary contrast.
Storage and Reheating
Store leftover soup in an airtight glass container in the coldest part of your refrigerator for up to 3 days.
Freezing is not recommended for this soup. The emulsion of dairy and cheese will break during the freezing and thawing process, resulting in a separated, watery texture.
For the best results, reheat the soup on the stovetop over low heat. Add 2 to 3 tablespoons of beef broth or milk to loosen the starch gel, and stir constantly until warmed through without letting it boil.
Alternatively, microwave individual portions at 50% power in 30-second intervals, stirring thoroughly between each cycle to prevent hot spots from breaking the cheese emulsion.
Ingredient Substitutes
You can adapt this recipe to suit your pantry with these precise ingredient swaps.
- Corned beef: Substitute with pastrami at a 1:1 ratio, which adds a deeper, smokier flavor profile to the base.
- Swiss cheese: Substitute with Gruyère or Emmental at a 1:1 ratio, keeping the melting characteristics identical while slightly elevating the nutty flavor.
- Sauerkraut: Substitute with drained kimchi at a 1:1 ratio to create a fusion profile similar to a Kimchi Reuben Sandwich, adjusting the simmer time down by 2 minutes to preserve the kimchi's texture.
- Whole milk: Substitute with heavy cream diluted with water (1/2 cup cream + 1 cup water) to maintain the fat content without altering the liquid volume.
This Reuben soup delivers all the complex, savory satisfaction of the classic sandwich in a comforting, spoonable format. By mastering the simple science of starch-stabilized cheese emulsions, you ensure a perfectly smooth, velvety bowl every single time.