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In a large pot or Dutch oven, melt the unsalted butter over medium heat. Add the diced yellow onion and celery stalk, cooking until softened, about 5 to 7 minutes.

Add the minced garlic and cook for 1 minute more until fragrant. Stir in the all-purpose flour and cook for 1 to 2 minutes, stirring constantly, to create a roux.

Gradually whisk in the chicken broth and milk until smooth. Bring the mixture to a gentle simmer, stirring occasionally to prevent lumps.

Add the diced Russet potatoes and caraway seeds to the pot. Season with kosher salt and freshly ground black pepper. Bring the soup back to a simmer, then reduce heat to low, cover, and cook for 15 to 20 minutes, or until the potatoes are very tender.

Once potatoes are tender, use a potato masher or an immersion blender to partially mash some of the potatoes directly in the pot. This will thicken the soup and create a creamy texture while leaving some potato chunks for body. (Alternatively, remove about 1 cup of potatoes, mash them, and return to the pot).

Stir in the Dijon mustard and heavy cream. Add the diced pastrami to the soup and heat through for 2 to 3 minutes, ensuring the pastrami is warmed but not overcooked.

Taste and adjust seasoning with additional salt and pepper if needed. Ladle the hot soup into bowls. Garnish each serving with a generous sprinkle of shredded Swiss cheese, chopped fresh parsley, and a dollop of sour cream, if desired. Serve immediately.


In a large pot or Dutch oven, melt the unsalted butter over medium heat. Add the diced yellow onion and celery stalk, cooking until softened, about 5 to 7 minutes.

Add the minced garlic and cook for 1 minute more until fragrant. Stir in the all-purpose flour and cook for 1 to 2 minutes, stirring constantly, to create a roux.

Gradually whisk in the chicken broth and milk until smooth. Bring the mixture to a gentle simmer, stirring occasionally to prevent lumps.

Add the diced Russet potatoes and caraway seeds to the pot. Season with kosher salt and freshly ground black pepper. Bring the soup back to a simmer, then reduce heat to low, cover, and cook for 15 to 20 minutes, or until the potatoes are very tender.

Once potatoes are tender, use a potato masher or an immersion blender to partially mash some of the potatoes directly in the pot. This will thicken the soup and create a creamy texture while leaving some potato chunks for body. (Alternatively, remove about 1 cup of potatoes, mash them, and return to the pot).

Stir in the Dijon mustard and heavy cream. Add the diced pastrami to the soup and heat through for 2 to 3 minutes, ensuring the pastrami is warmed but not overcooked.

Taste and adjust seasoning with additional salt and pepper if needed. Ladle the hot soup into bowls. Garnish each serving with a generous sprinkle of shredded Swiss cheese, chopped fresh parsley, and a dollop of sour cream, if desired. Serve immediately.
