Side Dishes
Transforming leftover corned beef into this pickle-braised hash with crispy potato layers turns dinner leftovers into a restaurant-worthy meal. The secret lies in layering thinly sliced potatoes with tangy pickles and reheated corned beef, then baking until the edges are golden and crispy—like a deconstructed Reuben sandwich in dish form. This method ensures every bite delivers that perfect balance of savory, tangy, and crispy textures without a single slice of bread.
The beauty of this recipe is its simplicity: no fancy techniques, just a baking dish and 30 minutes of hands-off cooking. You’ll start by layering thinly sliced potatoes and pickles, then top with shredded corned beef and a sprinkle of spices. As it bakes, the potatoes crisp up while the corned beef absorbs the tangy pickle juices, creating a dish that’s hearty enough for a main course but easy enough for a weeknight. The result? A crispy, flavor-packed hash that feels intentional, not like leftovers.
What makes this dish truly special is how it elevates simple ingredients—thinly sliced potatoes develop a satisfying crunch, while the pickles add a bright, tangy contrast to the rich corned beef. The key is baking at a high enough temperature to achieve that crispy edge without drying out the potatoes. Serve it with a dollop of mustard or a side of coleslaw to round out the meal, and you’ll have a dish that’s both nostalgic and elevated.
This recipe is perfect for using up corned beef leftovers while still feeling like a fresh, made-from-scratch meal. The layers create a visually appealing dish that’s just as satisfying to eat as it is to serve. Ready to turn leftovers into something extraordinary? Here’s how to make it happen.
Ingredients for leftover corned beef
Eight simple ingredients transform leftover corned beef into crispy, tangy hash layers.
| Ingredient | Amount | Notes |
|---|---|---|
| Corned Beef 🥩 | 1 ½ lb | Shredded or chopped from leftovers |
| Russet Potatoes 🥔 | 2 lbs | Thinly sliced (about 1/8-inch thick) |
| Dill Pickles 🥒 | 1 cup | Sliced, juice reserved |
| Yellow Onion 🧅 | 1 whole | Thinly sliced (about 1/8-inch thick) |
| Extra-Virgin Olive Oil 🫒 | ¼ cup | For crisping potatoes |
| Yellow Mustard 🍯 | 2 tbsp | Dijon preferred for tang |
| Dried Dill 🌿 | 1 tsp | Or 1 tbsp fresh chopped |
| Garlic Powder 🧄 | ½ tsp | Fresh minced preferred |
| Salt 🧂 | 1 tsp | Kosher or sea salt |
| Black Pepper 🌶️ | ½ tsp | Freshly ground preferred |
| Paprika 🌶️ | ½ tsp | Smoked for extra flavor |
| Fresh Parsley 🌿 | ¼ cup | Chopped, for garnish |
The potatoes are the foundation—Russets hold their shape best when thinly sliced. Grab a mandoline if you're feeling fancy, or use a sharp knife for even slices. Trader Joe's sells pre-sliced potatoes if you're short on time, but slicing them yourself ensures that crispy edge. The corned beef should be shredded or chopped into bite-sized pieces—thin slices reheat faster and absorb the pickle juices better. For the pickles, dill varieties like Kosher Dills work best—they're tangy but not too sweet. If you're using store-bought corned beef, check the label for added sugars or preservatives that might affect the flavor.
No dill pickles? Sour pickles or even sweet pickles will work, though the flavor profile changes slightly. Running out of Dijon mustard? Yellow mustard plus a pinch of sugar mimics the tang. Fresh garlic powder isn't available? Two minced garlic cloves (about 1 tsp) will give you more punch. The olive oil matters here—extra-virgin adds a fruity note that pairs well with the tangy pickles. If you're watching calories, reduce the oil to 2 tbsp and add 1 tbsp of pickle juice to keep the potatoes moist. For extra crispiness, toss the sliced potatoes with 1 tsp of cornstarch before baking.
This hash reheats beautifully—4-5 days in the fridge or 3 months frozen. For freezing, let it cool completely, then portion into airtight containers with a layer of parchment paper between layers to prevent sticking. To reheat, cover with foil and warm at 350°F for 15-20 minutes. The potatoes will lose some crispiness but regain it in the oven. Garnish with fresh parsley right before serving—it brightens up the dish and adds a pop of color. Store any leftover mustard in the fridge after opening, and the dried dill in a cool, dark place for up to 6 months.
Why You'll Love This Recipe
- One-Pan Magic: I swear by this—just slice the potatoes, dice the onions, and toss everything on a sheet with the corned beef. Twenty minutes later, you’ve got a meal that looks like it took hours (but didn’t).
- Pickle-Perfect Bite: That tangy crunch from the dill pickles cuts through the richness of the corned beef like a cool breeze. Honestly, I’ll eat this cold in a sandwich just for the contrast.
- Lunchbox Hero: Between us, this is my go-to for meal prep. Shred the beef, fluff the potatoes, and pack it all in containers—no reheating needed. My kids grab it straight from the fridge, no complaints.
- Budget Stretch: A single corned beef brisket feeds my family for days. The potatoes and onions bulk it up, and the pickles add freshness without costing a fortune. My wallet thanks me every time.
Step-by-step instructions for leftover corned beef hash
Transform your corned beef leftovers into a restaurant-worthy hash with crispy potato layers and tangy pickle accents.
Prep and Par-Cook the Potatoes
Slice the 2 lbs russet potatoes into 1/8-inch thick rounds using a mandoline or sharp knife. Toss them immediately in a large bowl with 1 tsp salt, 0.5 tsp black pepper, and 0.5 tsp paprika. This seasoning ensures every layer gets flavor as they crisp.
Heat 0.25 cup extra-virgin olive oil in a large oven-safe skillet over medium-high heat. Add half the potatoes in a single layer and cook undisturbed for 4-5 minutes until the edges begin to brown. Flip carefully and cook another 3-4 minutes until golden on both sides. Remove to a plate and repeat with remaining potatoes. They don't need to be fully cooked yet—just par-cooked for even crisping later.
Build the Hash Layers
Arrange the par-cooked potatoes back in the skillet in overlapping circles, slightly offset so edges peek through. This creates maximum crispy surface area. Scatter 1 whole yellow onion (sliced 1/8-inch thick) evenly over the potatoes, followed by the 1.5 lb shredded corned beef. The beef will absorb the flavors as it heats through.
In a small bowl, whisk together 2 tbsp yellow mustard, 1 tsp dried dill, and 0.5 tsp garlic powder with 2 tablespoons of reserved pickle juice. Drizzle this tangy mixture evenly over the hash. The mustard adds depth while the pickle juice prevents the potatoes from drying out during baking.
Braise and Crisp the Hash
Transfer the skillet to a 400°F preheated oven. Bake for 20-25 minutes until the potatoes are golden brown and crispy on the edges, while the corned beef heats through to an internal temperature of 165°F. You'll know it's ready when the top layer has a deep caramelized crust and the potatoes release easily from the pan.
During the last 5 minutes, sprinkle the 1 cup sliced dill pickles evenly over the top. The acidity from the pickles cuts through the richness of the corned beef, balancing the dish perfectly. Keep an eye on the hash—ovens vary, so check at the 20-minute mark if your oven runs hot.
Finish with Fresh Herbs and Serve
Remove the hash from the oven and let it rest for 5 minutes to allow the juices to redistribute. This resting step ensures every bite stays moist and flavorful. While it rests, chop the 0.25 cup fresh parsley finely and sprinkle it evenly over the top for a bright, fresh finish.
Serve immediately with a dollop of the reserved pickle juice on the side if desired. The contrast of crispy potatoes, tender corned beef, and tangy pickles makes this hash a satisfying way to use leftovers. Each bite delivers texture contrast—crunchy edges, creamy potatoes, and succulent beef—all tied together by the herby, slightly sweet pickle braise.
Pro Tips For Making Leftover Corned Beef
- CRACK THE POTATOES FIRST: Boil your Russets whole in salted water for 10 minutes before slicing—this guarantees they’ll hold shape when reheated. I learned this the hard way after serving mushy potato pancakes to a crowd. Use a fork to test doneness; they should pierce easily but not fall apart.
- SWEAT THE ONION LOW: Cook the yellow onion in olive oil over medium-low heat until it’s translucent and just starting to caramelize—about 8-10 minutes. High heat burns onions before they soften, and you’ll taste that bitterness in every bite. A splash of water at the end keeps them from sticking.
- SLICE PICKLES THIN: Cut the dill pickles into ¼-inch strips, not thick rounds. Thin slices crisp up when reheated, adding a tangy crunch that thick slices just can’t match. If you’re lazy, skip this step, but the texture won’t be the same—your future self will notice.
- REHEAT WITH JUICE: Don’t drain the corned beef juices—pour them into your reheating pan with the meat. The fat and liquid keep the beef moist and add depth to the potatoes. If it’s too watery, reduce it by half first; if it’s dry, add a splash of water or broth. This is the thing that matters most for tender, flavorful leftovers.
Best sauces and condiments for leftover corned beef
Mustard-Pickle Glaze
This tangy glaze is the star of the show—mix 2 tbsp yellow mustard with 2 tbsp reserved pickle juice and ½ tsp garlic powder. The mustard adds depth while the pickle juice keeps the potatoes moist and adds that signature tang. I love using Dijon mustard for its smooth texture, but regular yellow mustard works too. Brush this glaze over the hash just before baking to create a caramelized crust that ties everything together. 🌶️
Pickle Juice Reduction
For an extra flavor boost, reduce ½ cup reserved pickle juice in a small saucepan over medium heat until it thickens to a syrupy consistency—about 5-7 minutes. Drizzle this concentrated pickle reduction over the hash before serving. It adds a bright, acidic punch that cuts through the richness of the corned beef beautifully. Store any leftover reduction in the fridge for up to 1 week—it’s perfect for drizzling over eggs or sandwiches.
Spicy Horseradish Cream
For a kick of heat, whip together ¼ cup sour cream, 1 tbsp prepared horseradish, and ½ tsp lemon juice until smooth. Serve this alongside the hash for dipping or spooning over the top. The horseradish adds a sharp, peppery bite that pairs perfectly with the smoky corned beef. If you don’t have horseradish, a dash of cayenne pepper will give it a similar kick. 💥
Classic Reuben Sauce
Combine ¼ cup Thousand Island dressing, 1 tbsp ketchup, and 1 tsp apple cider vinegar for a quick Reuben-inspired sauce. This creamy, slightly sweet sauce mirrors the flavors of a classic Reuben sandwich but works beautifully with the hash. Serve it on the side for dipping or drizzle it over the top for extra richness. If you’re short on time, sub with Russian dressing for a similar tangy kick.
Garlic Aioli Dip
Blend ½ cup mayonnaise, 1 minced garlic clove, 1 tsp lemon juice, and ½ tsp salt until smooth for a creamy garlic aioli. This dip adds a buttery contrast to the crispy hash and pairs perfectly with the tangy flavors. For extra depth, add a pinch of smoked paprika or a dash of hot sauce to the mix. Store any leftovers in an airtight container in the fridge for up to 3 days.
Pickled Onion Topping
Quick-pickle ½ cup thinly sliced red onion in ¼ cup apple cider vinegar, 1 tsp sugar, and ½ tsp salt for 15 minutes before serving. These pickled onions add a bright, crunchy contrast to the hash. Toss them directly over the top or serve them on the side for dipping. The acidity balances the richness of the corned beef while adding a fresh crunch. 🥒
Nutrition facts
Frequently asked questions
Can I use this recipe with store-bought corned beef?
Yes! Store-bought corned beef works perfectly—just look for brands with minimal added sugars or preservatives for the best flavor. Shred or chop it into bite-sized pieces before layering. If your corned beef is particularly salty, reduce the added salt in the recipe by half to balance the flavors.
What if I don’t have a mandoline for slicing potatoes?
No problem! Use a sharp chef’s knife and cut the potatoes into 1/8-inch thick slices by hand. For even thickness, stack a few slices together and cut through all at once. A potato slicer attachment for a food processor also works well for consistent slices.
Can I make this hash ahead of time?
Assemble the hash up to 24 hours ahead and refrigerate uncovered. When ready to bake, add 5-10 extra minutes to the oven time to ensure the potatoes crisp up properly. For freezing, bake the hash fully, let it cool, then store in airtight containers for up to 3 months.
Why are my potatoes soggy instead of crispy?
Soggy potatoes usually mean too much moisture or not enough time in the oven. Par-cook them longer on the stovetop to remove excess liquid, and ensure your oven is at 400°F. Spread the potatoes in a single layer before baking, and avoid overcrowding. A sprinkle of cornstarch on the slices before baking can also help achieve crispiness.
What’s the best way to reheat leftover hash?
For best results, cover with foil and reheat at 350°F for 15-20 minutes until warmed through. To restore crispiness, transfer to a baking sheet and broil for 2-3 minutes at the end. Microwaving works in a pinch, but it’ll make the potatoes gummy—always cover with a damp paper towel to retain moisture.