Okay, So Here’s Why I Fell for This Creamy Reuben Soup

First off, I was never planning on falling head over heels for a soup that’s basically a sandwich in disguise, but here we are. My sister dared me to “turn leftovers into something edible for once,” so out came the kraut, the corned beef, and—well, the cheese was not originally intended for soup, but we make do. Isn’t it wild how sometimes the weirdest fridge experiments just work? My first time making this, I dripped half the broth down the side of the stove, and honestly, it still felt like a win. If you’ve ever had a Reuben sandwich and thought, “This would be perfect if only I could eat it with a spoon while wearing pajamas,” this is for you. (Also, sorry in advance to my cousin Joe who thinks every soup should be clear. Not this one, mate!)

Why You’ll Love This Soup (Or At Least, Why I Do)

I make this when I miss deli food but don’t want to wait in line (or chase after toddlers in a crowded booth). My family goes nuts for this—it’s one of those rare recipes nobody turns their nose up at. And you know those days where you just can’t face another grilled cheese? This hits all the same comfort notes. Plus, if you ever forgot to buy rye, I’ve got a trick for that below! Oh, and here’s a pro tip: don’t underestimate the power of melty Swiss; the first time I tried using cheddar instead, my husband politely said, “It’s fine,” which is code for “Don’t do that again.”

Stuff You’ll Need (But Substitution is My Middle Name)

2 tablespoons butter (unsalted, but the world won’t end if you use salted)
1 small yellow onion, chopped — or honestly, a shallot in a pinch
2 celery stalks, diced (skip if your fridge is empty, no biggie)
2 garlic cloves, minced (or cheat with a spoonful from the jar—am I lazy or efficient?)
1/4 cup all-purpose flour (I once used potato starch—strange, but not bad)
3 cups beef broth (homemade is cool, boxed is fine, bouillon cubes if you’re feeling wild)
1 1/2 cups half-and-half (milk totally works, but it’s less rich)
250g (about 9 oz) corned beef, chopped (I’ve used leftover brisket too!)
1 1/2 cups sauerkraut, drained
1 cup shredded Swiss cheese (sometimes I throw in a bit of Gruyere if I’m feeling posh)
1/2 teaspoon caraway seeds (Grandma says it’s non-negotiable, I say optional)
Freshly cracked black pepper to taste
Handful fresh dill or parsley (optional, for the fancy folk)
Rye bread, for croutons (any old bread will do, and sometimes I use crackers—shh!)

Here’s How You Actually Make This (Don’t Stress If It Looks Weird)

Melt your butter in a big ol’ pot on medium heat. This is where the onions, celery and garlic jump in together. Cook until everything softens up, maybe 5 min? I always get distracted and it goes a bit longer and that’s never hurt anybody.
Sprinkle over the flour, and stir—the whole thing’ll look strange and clumpy. Don’t panic. Cook a minute or two to cook that ‘raw’ taste out (I learned that the hard way; floury soup once, never again).
Slowly, slowly whisk in beef broth. I sometimes dump half in and regret it, so go slow unless you like lumpy soup. Pause here and sneak a taste if you want.
Add the half-and-half, and keep stirring. Don’t walk away just yet—milk will totally try to escape the pot.
Now the fun: stir in corned beef, sauerkraut, Swiss, caraway seeds, and black pepper. Simmer everything on low heat. Honestly, the cheese takes forever to melt but resist the urge to crank the heat. Your patience will be rewarded.
If it’s super thick, a splash more broth saves the day. If it’s thin, just bubble it a few minutes longer.
Meanwhile, cube up your rye bread (or whatever’s handy—bagels work!); toss in a pan with a lil’ butter till golden. Or chuck them in the air fryer, which is the one reason I use ours these days.
Ladle soup into bowls. Top with herby bits if you’re fancy, and pile on those crunchy croutons.

My Actual Notes From the Trenches

This is way creamier after it sits a bit, but sometimes the sauerkraut gets a touch strong—balance with extra broth if that happens.
I used to throw in all the cheese at once—honestly, it melts way better if you go handful by handful.
Once totally forgot to rinse the sauerkraut, and wow, too salty. So now I sometimes rinse, sometimes not—it’s a mood.

Some Soup Experiments That (Mostly) Worked

Smoked turkey instead of corned beef… was actually awesome, but too mild, so add a splash of Worcestershire.
Cheddar for Swiss? Family says no, but my cousin liked it. Take that for what you will.
Once I tried making it with coconut milk. Why? No idea. It tasted, uh, tropical and not in a good way. I do not recommend.

Do You Actually Need Fancy Gear?

Look, I use my Dutch oven, but any big pot works. If you don’t have a whisk, just use a fork and some elbow grease; I did for years. Immersion blender for ultra creaminess? Sure, but I only haul mine out when the soup’s gone a bit lumpy (which, honestly, is rare unless you’re really rushing).

How Long Will This Soup Last?

Technically, it should keep for 2-3 days in the fridge, tightly covered. But, confession time: I’ve almost never had leftovers past day one. Reheats super well in the microwave; just add a glug of broth or milk if it thickens up. Haven’t tried freezing it because—well, see above.

How I Like to Serve It (Besides Standing Over the Stove)

Totally personal, but I love a heap of croutons (soggy or crisp, both are great). Sometimes I add a stripe of spicy brown mustard on top for a little zing, ‘cause that’s how my aunt served her sandwiches. My son dunks pickles—hey, whatever floats your boat. If you’re planning a deli-themed dinner, maybe make classic Reuben sandwiches on the side, ‘cause you can never have too much of a good thing.

What I’ve Learned (Usually The Hard Way)

Once tried to rush the roux step and—no joke—my soup tasted like flour paste. Be patient. It matters!
Overcrowding the cheese leads to a weird, stringy mess. Sprinkle it in gradually. I only figured that out after, like, my third batch.
If the soup seems too thin, just simmer longer. Don’t panic and add more flour unless you like a gluey texture.

People Have Actually Asked Me…

Is this really like a Reuben sandwich? – Well, not exactly, ‘cause, no rye bread edges or drippy hands, but the soul is definitely there. And frankly, I think it tastes better the next day (if you’ve got the willpower to wait).
Can you make it vegetarian? – Sure thing! Go for veggie broth and sub in thick-sliced mushrooms (I like portobellos) with extra sauerkraut. Add smoked paprika if you miss the “meaty” note.
What if I don’t have sauerkraut? – You’ll miss the tang, but chopped pickles plus a splash of pickle juice gets you close. I did this once when I forgot kraut, and honestly, nobody mentioned it.
Do I have to make croutons? – Nope! Sometimes I just break up potato chips on mine. Or those little rye crisps—Trader Joe’s sells them. Here’s their rye crisp product if you’re into that.

Quick Little Tangent Because—Why Not?

Speaking of comfort food, have you ever tried making your own mustard? I once did after watching way too many cooking videos online (here’s a solid mustard recipe, if you’re feeling adventurous). It’s actually easier than I thought! I learned this because I was desperate and out of the store-bought kind, and my soup ended up tasting awesome. Anyway, back to our Reuben!