Slow-Cooker Corned Beef with Root Vegetable Puree

Corned beef in a slow cooker is one of those magical, mostly-hands-off recipes that delivers extraordinary results. By fully submerging the brisket in a dark, malty stout beer, the slow cooker maintains a gentle, steady heat over eight hours. This long, patient braise breaks down every tough fiber, yielding meat so tender it slices flawlessly against the grain without falling apart.

What truly sets this dish apart is the side: rather than serving waterlogged, boiled root vegetables, the parsnips, rutabagas, and potatoes are pulled from the savory cooking liquid and whipped smooth in a food processor with rich, unsalted butter. This silky, buttery puree has incredible depth and serves as the perfect velvety bed for the carved brisket.

Bacon-Sautéed Cabbage and the Mustard Sauce

For a satisfying crunch alongside the puree, the cabbage gets the star treatment. Thick-cut bacon is seared in a heavy skillet until crisp, rendering out its wonderful smoky fat. Sliced Savoy cabbage and onions are then sautéed directly in that rendered bacon fat, softening beautifully while absorbing all of those deep, savory notes and retaining a vibrant, distinct bite.

Tying it all together is a quick, tangy sauce whisked from prepared horseradish, sour cream, and Dijon mustard, loosened with a splash of the hot, beer-infused cooking liquid from the slow cooker. This bright, piquant drizzle cuts beautifully through the rich brisket and buttery puree, perfectly balancing every element on the plate.

Jorj Morgan

Slow-Cooker Corned Beef with Root Vegetable Puree

This exquisite slow-cooked corned beef melts into tender perfection, complemented by a silky root vegetable puree and savory bacon-sautéed cabbage. A piquant horseradish sauce adds a bright flourish to this deeply comforting and elegantly plated meal.

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Prep Time 25 minutes mins

Cook Time 8 minutes mins

Total Time 8 hours hrs 25 minutes mins

Servings: 6 servings

Course: Main Course, Dinner Party

Ingredients Method

Ingredients

  

The Brisket & Beer Braise

• 1 4-pound raw corned beef brisket
• 2 12-ounce bottles dark beer (stout or porter preferred)
• 2 dried bay leaves
• 1 teaspoon whole black peppercorns
• 1 teaspoon whole mustard seeds

The Root Vegetable Puree

• 6 small potatoes peeled and cut into 2-inch chunks
• 2 medium rutabagas peeled and cut into 2-inch chunks
• 2 medium parsnips peeled and cut into 2-inch chunks
• 4 small white onions peeled and cut into 2-inch chunks
• 2 tablespoons unsalted butter
• 1 teaspoon kosher salt
• ½ teaspoon coarse black pepper

The Bacon-Sautéed Cabbage

• 1 tablespoon olive oil
• ¼ pound thick-cut bacon about 4 to 5 slices, cut into 1-inch pieces
• 1 large white onion peeled and sliced
• 1 medium head Savoy cabbage cut into 2-inch slices

The Piquant Mustard Sauce

• 2 tablespoons prepared horseradish
• 2 tablespoons sour cream
• 1 teaspoon Dijon-style mustard
• 1 to 2 tablespoons hot cooking liquid from the slow cooker for thinning

Method

 

Slow-Cook the Brisket

1. Place the raw corned beef brisket directly into the insert of a heavy-capacity slow cooker.
2. Pour the 2 bottles of dark beer over the brisket to completely submerge it.
3. Drop the dried bay leaves, whole black peppercorns, and whole mustard seeds into the liquid.
4. Cover tightly and cook on HIGH for 7 to 8 hours. The low-and-slow cooking will break down the tough connective tissues, yielding a profoundly tender brisket.

Make the Vegetable Puree

1. During the final 2 hours of the braise, add the peeled potatoes, rutabagas, parsnips, and white onions directly into the slow cooker alongside the brisket. Cook until the vegetables are completely fork-tender.
2. Using a slotted spoon, carefully transfer the softened root vegetables from the slow cooker directly into the bowl of a food processor.
3. Add the 2 tablespoons of unsalted butter and pulse the machine until the vegetables are pureed into a smooth, silky mixture. Season aggressively with the kosher salt and coarse black pepper. Keep warm.

Rendering the Cabbage

1. Heat the 1 tablespoon of olive oil in a large, heavy skillet over medium-high heat. Add the 1-inch bacon pieces and cook until deeply browned and crisp, rendering out the smoky pork fat, about 3 to 4 minutes.
2. Use a slotted spoon to remove the bacon to a paper towel-lined plate to drain.
3. Add the sliced onion to the residual bacon fat in the skillet. Cook until soft, about 5 minutes.
4. Add the sliced Savoy cabbage to the pan. Sauté until the leaves are wilted and tender, about 8 to 10 minutes. Transfer the cabbage to a holding bowl, sprinkle heavily with the crumbled crisp bacon, and keep warm.

The Piquant Sauce & Assembly

1. In a small ceramic bowl, vigorously whisk together the horseradish, sour cream, and Dijon mustard. Stir in 1 to 2 tablespoons of the hot, beer-infused cooking liquid from the slow cooker to thin the sauce and bridge the flavors.
2. Transfer the rested corned beef to a cutting board and use a sharp knife to carve thin slices strictly against the grain to ensure a tender bite.
3. To serve, place a generous, sweeping spoonful of the root vegetable puree onto a warm plate. Top with the bacon-sautéed cabbage. Fan the sliced corned beef elegantly over the cabbage, and finish with a dollop of the piquant mustard sauce.