My uncle used to make this the morning after a big holiday dinner. I still can't figure out how he got it so incredibly crispy. It is the ultimate comfort food to wake up to.

This 4-ingredient corned beef hash is my ode to the kind of breakfast that magically appears the morning after a big holiday dinner. My uncle made a version of this with leftover corned beef and potatoes, and to this day I’m still chasing the way he got it shatteringly crispy on the outside while keeping everything tender inside. Corned beef hash itself is an old-fashioned comfort food with roots in frugality—using up bits of meat and potatoes from the night before—but when you cook it low and slow, then leave it alone long enough to form a deep brown crust, it becomes something much more memorable. This version keeps the ingredient list short and practical while focusing on the technique that gives you that irresistible crispiness.

Serve this corned beef hash piled onto warm plates with a couple of fried or poached eggs on top so the yolk can run into all the crispy edges. A simple side of sliced oranges or a small green salad with a sharp vinaigrette helps cut through the richness. If you like, offer hot sauce, grainy mustard, or a spoonful of sauerkraut on the side to echo the flavors of the original corned beef dinner. Strong coffee or black tea is a natural partner, and buttered toast or rye bread is perfect for scooping up every last crunchy bite.

Servings: 3–4

3 cups cooked potatoes, diced small (leftover boiled or roasted potatoes preferred)

Prep the ingredients: Cut the cooked potatoes and corned beef into small, even dice—about 1/4 inch if you can. Smaller pieces mean more surface area, which is the key to getting that ultra-crispy texture. Finely chop the onion so it softens and browns without burning.

Dry the potatoes: If your potatoes are at all wet (from boiling or being stored in the fridge), pat them dry thoroughly with paper towels. Excess moisture is the enemy of crispiness; taking a minute here pays off in the pan.

Preheat the pan: Set a large heavy skillet—cast iron is ideal—over medium heat. Let it heat for a full 2–3 minutes so the surface is evenly hot. Add 2 tablespoons of the butter and swirl to coat the bottom.

Cook the onion: Add the chopped onion and a pinch of salt to the skillet. Cook, stirring occasionally, until the onion turns soft and lightly golden, about 5–7 minutes. You want it sweet and translucent with just a bit of color, not dark brown.

Build the hash base: Add the diced potatoes to the skillet, spreading them out in an even layer over the onions. Dot the top with the remaining 2 tablespoons butter. Sprinkle with the remaining salt and the black pepper. Gently toss or fold everything together just until coated, then spread it back out into an even layer.

Press and brown (no stirring yet): Use a spatula to firmly press the mixture down into the pan, almost like forming one big pancake. Turn the heat down slightly to medium-low. Let the hash cook undisturbed for 8–10 minutes. This patience is what creates that deep, crispy crust your uncle would be proud of.

Add the corned beef: Once the bottom is well browned and crisp around the edges, scatter the diced corned beef evenly over the top of the potatoes. Gently press it down with the spatula so it makes good contact with the pan. Continue cooking, still mostly undisturbed, for another 6–8 minutes. If you smell any scorching, lower the heat.

Flip in sections: Slide your spatula under a portion of the hash and peek—if it’s deeply golden and crisp, flip that section over. Don’t worry about keeping it perfect; rustic chunks are part of the charm. Flip the hash in a few big pieces until most of the browned side is now on top. Cook for another 5–7 minutes to crisp the second side, pressing gently again to encourage contact with the pan.

Taste and adjust: Taste a small bite and adjust seasoning with a bit more salt or pepper if needed. If you like extra crispy bits, break the hash up a little more and let some of the softer pieces continue to brown another minute or two.

Serve hot: Spoon the corned beef hash onto warm plates so the crust stays crisp. Serve immediately, ideally with eggs, toast, and hot sauce alongside.

For a richer, almost lacy crust, swap half the butter for a neutral oil with a higher smoke point and keep the heat on the lower side of medium so you can cook longer without burning. If you like a slightly creamier interior, gently mash a few of the potatoes with the back of your spatula once they’re in the pan; this creates a mix of textures—crisp outside, soft inside. To echo the flavors of a classic corned beef dinner, you can stir in a small handful of finely shredded cabbage during the last 5 minutes of cooking, letting it wilt and brown around the edges. A spoonful of chopped fresh parsley or chives sprinkled over the top just before serving adds a fresh note that balances the richness. If you don’t have leftover potatoes, you can quickly parboil peeled, diced raw potatoes in salted water for 5–7 minutes, drain very well, and let them steam-dry before proceeding. For those who prefer less butter, use mostly oil in the pan but finish with a small knob of butter at the end for flavor. And if you want to serve a crowd, you can press the mixture into two smaller skillets instead of one crowded pan—more room means more crisp edges, which is exactly what makes this hash so satisfying.